Google Authenticator adds an extra layer of security to your online accounts by adding a second step of verification when you sign in. This means that in addition to your password, you'll also need to enter a code that is generated by the Google Authenticator app on your phone.
Note: You can only activate Google Authenticator App once you already setup the 2-Step Verification.
1. Open your Gmail account on Google Chrome
2. Click on your name initial at the top right corner
3. Click on Manage your Google Account
4. Click on Security on the left-hand side
5. Click on Authenticator
6. Follow the on-screen instruction and enter the code to verif