To verify your 2-factor authentication. 

> On the top right open the Profile page Link and click on security. 

> 2 step verification page will appear, enable on switching the icon right.
> Scan the given bar code on a Google Authenticator app and
 Enter the OTP and Submit. 

> Now you will get the OTP on your email. Enter the OTP received on Email.

Your 2 step verification status is active. for more, follow the How-To guide on 2FA Details.