To enable Google Authenticator, follow the instruction:
1) Go to the Personal details section of your account
2) Click on the Enable Google Authenticator button
Follow the links to download Google Authenticator from the App Store or Google Play
Scan the QR code using Google Authenticator
Enter the code it gives you
Click Enable Google Authenticator
Now, you will receive unique codes instead of SMS during 2FA. The codes will be different every time – no need to memorize them.