diff --git a/src/main/java/org/to/telegramfinalproject/Client/SidebarAction.java b/src/main/java/org/to/telegramfinalproject/Client/SidebarAction.java
index 8ad934a..4a16145 100644
--- a/src/main/java/org/to/telegramfinalproject/Client/SidebarAction.java
+++ b/src/main/java/org/to/telegramfinalproject/Client/SidebarAction.java
@@ -9,4 +9,4 @@ public enum SidebarAction {
     SETTINGS,
     FEATURES,
     Q_AND_A
-}
+}
\ No newline at end of file
diff --git a/src/main/java/org/to/telegramfinalproject/Client/SidebarHandler.java b/src/main/java/org/to/telegramfinalproject/Client/SidebarHandler.java
index 7edae86..c042c7a 100644
--- a/src/main/java/org/to/telegramfinalproject/Client/SidebarHandler.java
+++ b/src/main/java/org/to/telegramfinalproject/Client/SidebarHandler.java
@@ -1,5 +1,6 @@
 package org.to.telegramfinalproject.Client;
 
+import org.json.JSONException;
 import org.json.JSONObject;
 
 import java.util.Scanner;
@@ -51,7 +52,13 @@ public class SidebarHandler {
             return;
         }
 
-        JSONObject profile = response.getJSONObject("data");
+        JSONObject profile;
+        try {
+            profile = response.getJSONObject("data");
+        } catch (JSONException e) {
+            System.out.println("Received malformed profile data from server.");
+            return;
+        }
 
         String profileName = profile.optString("profile_name", "NOT-AVAILABLE");
         String userId = profile.optString("user_id", "NOT-AVAILABLE");
@@ -63,7 +70,7 @@ public class SidebarHandler {
         System.out.println("===== My Profile =====");
         System.out.println("Profile Picture URL : " + profilePictureUrl);
         System.out.println("Profile Name        : " + profileName);
-        System.out.println("User ID             : " + userId);
+        System.out.println("User ID             : @" + userId);
         System.out.println("Status              : " + status);
         System.out.println("Bio                 : " + bio);
         System.out.println("======================");
@@ -103,19 +110,117 @@ public class SidebarHandler {
     }
 
     private void editProfileName() {
+        System.out.println("Enter your new profile name:");
+        String newProfileName = scanner.nextLine().trim();
 
+        // Step 1: Validate input
+        while (newProfileName.trim().isEmpty()) {
+            System.out.println("Profile name cannot be empty. Enter another name.");
+            newProfileName = scanner.nextLine().trim();
+        }
+
+        // Step 2: Create request
+        JSONObject request = new JSONObject();
+        request.put("action", "edit_profile_name");
+        request.put("new_profile_name", newProfileName);
+
+        // Step 3: Send request and receive response
+        JSONObject response = ActionHandler.sendWithResponse(request);
+
+        // Step 4: Handle response
+        if (response == null || !response.optString("status", "fail").equals("success")) {
+            System.out.println("Failed to update profile name.");
+        } else {
+            System.out.println("Profile name updated successfully!");
+        }
     }
 
     private void editUserId() {
+        while (true) {
+            System.out.println("Enter your new user ID: ");
+            String newUserId = scanner.nextLine().trim();
 
+            if (newUserId.isEmpty()) {
+                System.out.println("User ID cannot be empty.");
+                continue;
+            }
+
+            if (newUserId.contains(" ")) {
+                System.out.println("User ID cannot contain spaces.");
+                continue;
+            }
+
+            if (!newUserId.matches("^[a-zA-Z0-9_]+$")) {
+                System.out.println("User ID can only contain letters, digits, and underscores.");
+                continue;
+            }
+
+            // Send to server
+            JSONObject request = new JSONObject();
+            request.put("action", "edit_user_id");
+            request.put("new_user_id", newUserId);
+            JSONObject response = ActionHandler.sendWithResponse(request);
+
+            if (response.getString("status").equals("success")) {
+                System.out.println("User ID updated successfully.");
+                break;
+            } else {
+                // Server-side error message (e.g., ID already exists)
+                System.out.println(response.getString("message"));
+            }
+        }
     }
 
     private void editBio() {
+        System.out.println("Enter your new bio:");
+        String newBio = scanner.nextLine().trim();
 
+        // Limit the bio length
+        if (newBio.length() > 70) {
+            System.out.println("Bio cannot be more than 70 characters.");
+            return;
+        }
+
+        JSONObject request = new JSONObject();
+        request.put("action", "edit_bio");
+        request.put("new_bio", newBio);
+
+        JSONObject response = ActionHandler.sendWithResponse(request);
+
+        if (response.getString("status").equals("success")) {
+            System.out.println("Bio updated successfully.");
+        } else {
+            System.out.println(response.getString("message"));
+        }
     }
 
     private void editProfilePictureUrl() {
+        while (true) {
+            System.out.println("Enter new profile picture URL (or leave empty to remove):");
+            String newImageUrl = scanner.nextLine().trim();
 
+            if (newImageUrl.contains(" ")) {
+                System.out.println("URL cannot contain spaces.");
+                continue;
+            }
+
+            if (!newImageUrl.isEmpty() && !newImageUrl.matches("^(http|https)://.*$")) {
+                System.out.println("Invalid URL format. Please enter a valid HTTP/HTTPS link.");
+                continue;
+            }
+
+            JSONObject request = new JSONObject();
+            request.put("action", "edit_profile_picture");
+            request.put("new_image_url", newImageUrl);
+            JSONObject response = ActionHandler.sendWithResponse(request);
+
+            if (response.getString("status").equals("success")) {
+                System.out.println("Bio updated successfully.");
+            } else {
+                System.out.println(response.getString("message"));
+            }
+            break;
+        }
     }
 
     private void createNewGroup() {
diff --git a/src/main/java/org/to/telegramfinalproject/Database/userDatabase.java b/src/main/java/org/to/telegramfinalproject/Database/userDatabase.java
index 6064500..dc9d7dc 100644
--- a/src/main/java/org/to/telegramfinalproject/Database/userDatabase.java
+++ b/src/main/java/org/to/telegramfinalproject/Database/userDatabase.java
@@ -152,7 +152,7 @@ public class userDatabase {
     }
 
     public boolean save(User user) {
-        String query = "INSERT INTO users (user_id, internal_uuid, username, password, profile_name) VALUES (?, ?, ?, ?, ?)";
+        String query = "INSERT INTO users (user_id, internal_uuid, username, password, profile_name, bio, image_url) VALUES (?, ?, ?, ?, ?, ?, ?)";
 
         try {
             boolean var5;
@@ -165,6 +165,8 @@ public class userDatabase {
                 stmt.setString(3, user.getUsername());
                 stmt.setString(4, user.getPassword());
                 stmt.setString(5, user.getProfile_name());
+                stmt.setString(6, user.getBio());
+                stmt.setString(7, user.getImage_url());
                 var5 = stmt.executeUpdate() > 0;
             }
 
@@ -223,7 +225,7 @@ public class userDatabase {
     }
 
     private User extractUser(ResultSet rs) throws SQLException {
-        return new User(rs.getString("user_id"), UUID.fromString(rs.getString("internal_uuid")), rs.getString("username"), rs.getString("password"), rs.getString("profile_name"));
+        return new User(rs.getString("user_id"), UUID.fromString(rs.getString("internal_uuid")), rs.getString("username"), rs.getString("password"), rs.getString("profile_name"), rs.getString("bio"), rs.getString("image_url"));
     }
 
     public boolean deleteByUUID(UUID uuid) {
@@ -288,7 +290,9 @@ public class userDatabase {
                         UUID.fromString(rs.getString("internal_uuid")),
                         rs.getString("username"),
                         rs.getString("password"),
-                        rs.getString("profile_name")
+                        rs.getString("profile_name"),
+                        rs.getString("bio"),
+                        rs.getString("image_url")
                 );
 
                 user.setBio(rs.getString("bio"));
diff --git a/src/main/java/org/to/telegramfinalproject/Models/User.java b/src/main/java/org/to/telegramfinalproject/Models/User.java
index 73ac635..a8d9e29 100644
--- a/src/main/java/org/to/telegramfinalproject/Models/User.java
+++ b/src/main/java/org/to/telegramfinalproject/Models/User.java
@@ -22,12 +22,14 @@ public class User {
     private List<Message> unreadMessages;
     private List<ChatEntry> chatList;
 
-    public User(String user_id, UUID internal_uuid, String username, String password, String profile_name) {
+    public User(String user_id, UUID internal_uuid, String username, String password, String profile_name, String bio, String image_url) {
         this.user_id = user_id;
         this.internal_uuid = internal_uuid;
         this.username = username;
         this.password = password;
         this.profile_name = profile_name;
+        this.bio = bio;
+        this.image_url = image_url;
     }
 
     public void setUser_id(String user_id) {
diff --git a/src/main/java/org/to/telegramfinalproject/Server/AuthService.java b/src/main/java/org/to/telegramfinalproject/Server/AuthService.java
index 1534c46..f50da87 100644
--- a/src/main/java/org/to/telegramfinalproject/Server/AuthService.java
+++ b/src/main/java/org/to/telegramfinalproject/Server/AuthService.java
@@ -20,7 +20,7 @@ public class AuthService {
             } else {
                 UUID uuid = UUID.randomUUID();
                 password = PasswordHashing.hash(password);
-                User user = new User(user_id, uuid, username, password, profile_name);
+                User user = new User(user_id, uuid, username, password, profile_name, "", "");
                 return this.userDb.save(user);
             }
         } else {
diff --git a/src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java b/src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java
index 6affe43..50769b4 100644
--- a/src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java
+++ b/src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java
@@ -1722,6 +1722,62 @@ public class ClientHandler implements Runnable {
                         break;
                     }
 
+                    case "edit_profile_name": {
+                        // Validate input
+                        if (!requestJson.has("new_profile_name")) {
+                            response = new ResponseModel("error", "Missing new profile name.");
+                            break;
+                        }
+
+                        String user_id = this.currentUser.getUser_id();
+                        String newProfileName = requestJson.getString("new_profile_name");
+
+                        response = SidebarService.updateProfileName(user_id, newProfileName);
+                        break;
+                    }
+
+                    case "edit_user_id": {
+                        // Validate input
+                        if (!requestJson.has("new_user-id")) {
+                            response = new ResponseModel("error", "Missing new user ID.");
+                            break;
+                        }
+
+                        String currentUserId = this.currentUser.getUser_id();
+                        String newUserId = requestJson.getString("new_user_id");
+
+                        response = SidebarService.updateUserId(currentUserId, newUserId);
+                        break;
+                    }
+
+                    case "edit_bio": {
+                        // Validate input
+                        if (!requestJson.has("new_bio")) {
+                            response = new ResponseModel("error", "Missing new bio.");
+                            break;
+                        }
+
+                        String currentUserId = this.currentUser.getUser_id();
+                        String newBio = requestJson.getString("new_bio").trim();
+
+                        response = SidebarService.updateBio(currentUserId, newBio);
+                        break;
+                    }
+
+                    case "edit_profile_picture": {
+                        // Validate input
+                        if (!requestJson.has("new_image_url")) {
+                            response = new ResponseModel("error", "Missing new image url.");
+                            break;
+                        }
+
+                        String currentUserId = this.currentUser.getUser_id();
+                        String newImageUrl = requestJson.getString("new_image_url").trim();
+
+                        response = SidebarService.updateProfilePicture(currentUserId, newImageUrl);
+                        break;
+                    }
+
                     default:
                         response = new ResponseModel("error", "Unknown action: " + action);
                 }
diff --git a/src/main/java/org/to/telegramfinalproject/Server/SidebarService.java b/src/main/java/org/to/telegramfinalproject/Server/SidebarService.java
index eb67f6f..920e195 100644
--- a/src/main/java/org/to/telegramfinalproject/Server/SidebarService.java
+++ b/src/main/java/org/to/telegramfinalproject/Server/SidebarService.java
@@ -2,8 +2,11 @@ package org.to.telegramfinalproject.Server;
 
 import org.json.JSONObject;
 import org.to.telegramfinalproject.Database.userDatabase;
+import org.to.telegramfinalproject.Models.ResponseModel;
 import org.to.telegramfinalproject.Models.User;
 
+import java.util.Objects;
+
 public class SidebarService {
     private static userDatabase userDB = new userDatabase();
 
@@ -25,33 +28,128 @@ public class SidebarService {
         return profile;
     }
 
-    // Updates one or more profile fields for the user
-    public static JSONObject updateUserProfile(String userId, JSONObject updateData) {
-        return null;
+    // Changes the user's profile picture
+    public static ResponseModel updateProfilePicture(String userId, String newImageUrl) {
+        User user = userDB.findByUserId(userId);
+        if (user == null) {
+            return new ResponseModel("error", "User not found.");
+        }
+
+        String currentUrl = user.getImage_url();
+        if (Objects.equals(currentUrl, newImageUrl)) {
+            return new ResponseModel("error", "No changes made. Profile picture is the same.");
+        }
+
+        user.setImage_url(newImageUrl); // Can be null
+        boolean success = userDB.updateByUUID(user.getInternal_uuid(), user);
+
+        if (success) {
+            return new ResponseModel("success", "Profile picture updated successfully.");
+        } else {
+            user.setImage_url(currentUrl);
+            return new ResponseModel("error", "Failed to update profile picture.");
+        }
     }
 
-    // Changes the user's profile picture
-    public static JSONObject changeProfilePicture(String userId, byte[] imageData) {
-        return null;
+    // Changes user's bio
+    public static ResponseModel updateBio(String userId, String newBio) {
+        if (newBio.length() > 70) {
+            return new ResponseModel("error", "Bio is too long.");
+        }
+
+        User user = userDB.findByUserId(userId);
+        if (user == null) {
+            return new ResponseModel("error", "User not found.");
+        }
+
+        String currentBio = user.getBio();
+        if (Objects.equals(currentBio, newBio)) {
+            return new ResponseModel("error", "No changes made. Bio is the same.");
+        }
+
+        user.setBio(newBio);
+        boolean success = userDB.updateByUUID(user.getInternal_uuid(), user);
+
+        if (success) {
+            return new ResponseModel("success", "Bio updated successfully.");
+        } else {
+            user.setBio(currentBio);
+            return new ResponseModel("error", "Failed to update bio.");
+        }
     }
 
     // Changes user-id
-    public static JSONObject updateUserId(String userId, String newUserId) {
-        return null;
-    }
+    public static ResponseModel updateUserId(String currentUserId, String newUserId) {
+        if (newUserId == null || newUserId.trim().isEmpty()) {
+            return new ResponseModel("error", "User ID cannot be empty.");
+        }
 
-    // (Optional) Changes username
-    public static JSONObject updateUserName(String userId, String newUserName) {
-        return null;
+        newUserId = newUserId.trim();
+
+        if (newUserId.contains(" ")) {
+            return new ResponseModel("error", "User ID cannot contain spaces.");
+        }
+
+        if (!newUserId.matches("^[a-zA-Z0-9_]+$")) {
+            return new ResponseModel("error", "User ID can only contain letters, digits, and underscores.");
+        }
+
+        if (userDB.findByUserId(newUserId) != null) {
+            return new ResponseModel("error", "This user ID is already taken.");
+        }
+
+        User user = userDB.findByUserId(currentUserId);
+        if (user == null) {
+            return new ResponseModel("error", "User not found.");
+        }
+
+        if (Objects.equals(currentUserId, newUserId)) {
+            return new ResponseModel("error", "No changes made. User ID is the same.");
+        }
+
+        user.setUser_id(newUserId);
+
+        boolean saved = userDB.updateByUUID(user.getInternal_uuid(), user);
+        if (saved) {
+            return new ResponseModel("success", "User ID updated successfully.");
+        } else {
+            user.setUser_id(currentUserId);
+            return new ResponseModel("error", "Failed to update user ID due to server error.");
+        }
     }
 
     // Changes user's profile name
-    public static JSONObject updateProfileName(String userId, String newProfileName) {
-        return null;
+    public static ResponseModel updateProfileName(String userId, String newProfileName) {
+        if (newProfileName == null || newProfileName.trim().isEmpty()) {
+            return new ResponseModel("error", "Invalid input."); // Invalid input (empty or just spaces)
+        }
+
+        // Fetch the user from database
+        User user = userDB.findByUserId(userId);
+        if (user == null) {
+            return new ResponseModel("error", "User not found."); // User doesn't exist
+        }
+
+        String oldName = user.getProfile_name();
+        if (Objects.equals(oldName, newProfileName)) {
+            return new ResponseModel("error", "No changes made. Profile name is the same.");
+        }
+
+        // Only set the profile name *after* successful DB update
+        user.setProfile_name(newProfileName);
+
+        boolean saved = userDB.updateByUUID(user.getInternal_uuid(), user);
+
+        if (saved) {
+            return new ResponseModel("success", "Profile name updated successfully.");
+        } else {
+            user.setProfile_name(oldName);
+            return new ResponseModel("error", "Failed to update profile name.");
+        }
     }
 
-    // Changes or sets the user's date of birth
-    public static JSONObject updateDateOfBirth(String userId, String newDateOfBirth) {
-        return null;
+    // Changes username
+    public static boolean updateUserName(String userId, String newUserName) {
+        return false;
     }
 }
\ No newline at end of file