Once your account has been verified, you are ready to set up “Double Authentication” using the google authenticator. Visit "2 Factor Auth" link seen under Account > Settings menu after you have signed in. You need your mobile phone to generate a unique 6 digit code to login and spend the funds. Google authenticator is available for android, IOS devices and blackberry devices. To install google authenticator on your mobile visit https://support.google.com/accounts/answer/1066447?hl=en.