You can use SMS, Authy or Yubikey, a One Time Password (OTP) generator device, as your 2FA method.
When you sign up for a Coinfloor account you will need to register your phone number for 2FA purposes.
You will then receive a 2FA code by SMS every time you log in to your account.
If you prefer to use Authy please see here for instructions on how to disable SMS and set up Authy.
If you prefer to use Yubikey please contact Support to change your registered 2FA method.