Select "Authenticator app" option from the 2-Step Verification Method screen.
Note: In this example we are configuring the first verification method for our account. 2-Step Verification Method screen looks different if you already have another verification method enabled.
Enter the name by which you will recognize the device which has the authenticator app installed.
"Open" Authenticator app on your phone.
Note: In this example we are using the Google Authenticator app, but there are other alternatives. See the following article for suggestions: Google Authenticator Alternatives
Use the Authenticator app to scan the QR code on the screen, then click "Next".
Authenticator app should generate a changing verification code for your account.
Enter the code provided by Authenticator app and click "Next".
Click "Done" to finish the configuration process.