Google Authenticator (2FA)
Google Authenticator is optional, but helps protect your account from hackers. If you set it up, you will need the authenticator code every time you login, or make a withdrawal.
Use the Google Authenticator App to scan the QR code, or manually enter the code into your authenticator app.
Download
Google Authenticator: Android - iOS - Blackberry
Other authenticators: Windows Phone - Windows Phone - Windows Desktop - Windows Desktop - Mac, iOS, Android (Authy)