Two-factor authentication is a security measure to prevent your account from being stolen. In order to protect your account, you must have an APP that allows you to activate 2FA, e.g. Google Authenticator, OTP Auth, Authy or any other of your preference. 

To activate 2fa, go to the top menu on the Builderall dashboard and choose "Account"

And then choose "Advanced Configurations"

In the Account Info area on the general tab, choose "Enable 2fa token"

Once you have read the information provided, click "Activate"