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Open your web browser or Facebook app and enter your login credentials to access your account.
Click on the **downward arrow** in the top right corner of the Facebook homepage. Select **Settings & Privacy**, then click on **Settings**.
In the left sidebar, click on **Privacy**. Here, you can manage who can see your posts, who can send you friend requests, and who can look you up using your email or phone number.
In the Privacy settings, find the option **Limit Past Posts** and click on it. Confirm that you want to limit the audience for posts you’ve shared with friends of friends or public.
Go to your profile page and click on **About**. Review each section and set the audience for your information (e.g., **Friends**, **Only Me**) to ensure only selected people can see your details.