When logging in to any accounts you’ve connected to Google Authenticator, you’ll open the app, locate the impermanent code associated with that account, and use it to finish the process.

You'll get a QR code or setup key. Next, open the Google Authenticator app and tap the plus sign. Record the 2FA code/key. Whenever you're asked for the 2FA code, open Google Authenticator to find it.

Google Authenticator is a two-step verification software used to keep your Google account and its related apps and programs more secure.