Visit https://myaccount.google.com/security

Scroll down to “Signing in with Google” and click 2-Step Verification​

Click on Get Started ​

Select your 2-Factor authentication method. It can be another device with Google installed, or you can use your phone number for text message verification.​

Add a backup authentication method ​

Confirm that 2-factor authentication works. ​

Complete 2-factor authentication setup by clicking Turn On ​