When you log in to your site, you may be asked to turn on two-factor authentication. This is your site’s login security adding a standard second step that protects your admin account beyond a password.
If you already use an authenticator app. Nothing changes for you. Your existing setup carries over and your codes keep working.
If you have not set it up yet. You see a short prompt the next time you log in. Setup takes about two minutes with any authenticator app. Google Authenticator, Authy, Microsoft Authenticator, and similar apps all work. There is a grace period before two-factor authentication becomes required, so you do not have to do it mid-task.
Backup codes. When you finish setup, you also get a set of one-time backup codes. Save them somewhere safe. They let you log in if you ever lose access to your phone.
Start from your normal login page. Always begin from your usual login page, such as your own bookmark. Do not follow a login link sent by email to set this up.