Facebook page superusers, also called "admins" or "administrators," have the power to create wall posts and make changes to the assigned Facebook page. If someone you assigned the superuser role to is no longer with your group or organization, consider revoking the person's privileges as an administrator. This prevents the person who is no longer affiliated with the organization from making changes to the page.
Visit Facebook.com and click on "Account." Click on "Use as Page."
Select the page that you want to remove the superuser from. Click "Edit Page."
Click on "Manage Admins." Locate the administrator you want to revoke privileges from.
Click "Remove" next to the admin's name. Click on "Save Changes." The user can no longer manage the Facebook page.