When you assign anyone as an admin to your account it means you are giving them the right to make changes to your account and they will be able to access your account privacy. So, always be careful before choosing any person as your admin. Here are steps to add admin on Facebook page:
- Open your Facebook account
- Click on the hamburger icon
- Then go to settings
- Select page roles
- Tap on add person to page
- Then add someone whom you want to be as an admin