To change your name on Facebook, follow these steps:

1. Log In: Go to Facebook and log in to your account using your current credentials.
2. Access Settings: Click on the downward-pointing arrow in the upper-right corner of the Facebook homepage to open a dropdown menu. From this menu, select “Settings & Privacy,” then choose “Settings.”
3. Edit Name: In the left sidebar, click on “Personal Information.” On the right side of the page, you’ll see your name displayed under “Name.” Click “Edit” next to your name.
4. Enter New Name: Enter your new first name and, if applicable, your new middle or last name. Facebook has guidelines on what names are allowed, so make sure you adhere to them. Generally, your name should be your real name as it appears on official identification documents.
5. Review Changes: After you’ve entered your new name, Facebook will show you how your name will appear. Review this and make sure it’s correct.
6. Password Confirmation: To save your changes, you’ll need to enter your Facebook password. This is for security purposes.
7. Change Name: Click the “Save Changes” button to update your name.

Please note that Facebook has certain policies regarding name changes. You may be required to provide documentation, like a driver’s license or passport, if Facebook needs to verify your name change. Additionally, Facebook has limits on how frequently you can change your name. Make sure you’re following Facebook’s guidelines and policies throughout this process.

To change your Facebook password, follow these steps:

1. Log In: Open your web browser and go to the Facebook website (facebook.com). If you’re not already logged in, enter your current login credentials (email or phone number and password) and click “Log In.”
2. Access Settings: Click on the downward-facing arrow in the top right corner of the Facebook page. This will open a dropdown menu. From the menu, select “Settings & Privacy,” then choose “Settings.”
3. Security and Login: In the left sidebar of the Settings page, click on “Security and Login.”
4. Change Password: Under the “Login” section, you’ll see an option to “Change password.” Click on the “Edit” link next to it.
5. Current Password: Facebook will first ask you to confirm your current password for security purposes. Enter your current password in the provided field.
6. New Password: In the next section, you can create a new password. It’s essential to choose a strong and unique password. Facebook will show the strength of your password as you type it. Try to include a mix of uppercase letters, lowercase letters, numbers, and symbols.
7. Confirm Password: Re-enter the new password in the “Confirm new password” field to ensure it matches the one you entered in the previous step.
8. Save Changes: Once you’ve entered your current password and your new password twice, click the “Save Changes” button.
9. Confirmation: Facebook may ask you to confirm your identity by entering a security code sent to your email or mobile phone. This is an additional security step to ensure that it’s you changing the password.
10. Password Changed: If everything is successful, you’ll receive a notification that your password has been changed. You should now use your new password to log in to Facebook.

To clear your Facebook search history, follow these steps:

1. Open Facebook: Log in to your Facebook account using a web browser or the Facebook mobile app.
2. Access Activity Log: On the web, click the down arrow in the top-right corner of the Facebook page, then click “Settings & Privacy” > “Activity Log.” On the mobile app, tap the three horizontal lines in the bottom-right corner, scroll down, and under “Settings & Privacy,” tap “Activity Log.”
3. View & Manage Activity: In the Activity Log, you’ll see a list of your recent activity on Facebook. To clear your search history, click or tap “More” on the left sidebar, then select “Search History.”
4. Clear Search History: On the web, click “Clear Searches” at the top right of the search history. On the mobile app, tap “Clear Searches” at the top of the search history.
5. Confirm: You’ll be asked to confirm that you want to clear your search history. Click or tap “Clear Searches” again to confirm.

To delete Facebook messages, you can use the Messenger app or the Facebook website. Here are steps for both methods:

Using Facebook Messenger (App):

1. Open Messenger: Launch the Facebook Messenger app on your mobile device.
2. Select Conversation: Tap on the conversation that contains the message(s) you want to delete.
3. Delete a Message: To delete a specific message, tap and hold the message you want to remove. You should see options like “Delete” or a trash can icon. Tap “Delete” and confirm.
4. Delete an Entire Conversation: If you want to delete an entire conversation, open the conversation, tap the contact’s name at the top, and select “Delete.”

Using Facebook Website:

1. Log In: Go to the Facebook website and log in to your account.
2. Open Messenger: Click the Messenger icon (it looks like a speech bubble) in the upper-right corner.
3. Select Conversation: Click on the conversation containing the messages you want to delete.
4. Delete a Message: Hover your mouse over the message you want to delete. You’ll see three dots (…) on the right side of the message. Click these dots and select “Delete.” Confirm the deletion.
5. Delete an Entire Conversation: To delete an entire conversation, click the gear icon (⚙️) at the top of the chat and select “Delete.” Confirm the deletion.

Remember that when you delete a message or conversation, it will only be deleted from your account. The other person(s) in the conversation will still have their copy of the messages unless they also delete them.