To reset your Facebook account settings: Log into your Facebook account with your Facebook login details. Click the gear shaped icon on the upper right corner of your Facebook account page. Select either the Account settings or the Privacy settings option from the drop down list that appears on your screen. Click the Edit button located in the bottom left corner of both sections to open the corresponding settings pages.
On the Account settings page, locate the Reset account link and click it to begin resetting your account. On the Privacy settings page, locate and click the Change privacy settings link to set new privacy preferences for your Facebook profile. Be sure to review all of the options before making any changes.