During your Account Activation process (Step 1 via Get Started) you will be or were directed to setup your primary Multi-Factor Authentication (MFA) method, to access ½ûÂþÌìÌà resources.
It is strongly recommended that you take the time to setup a secondary (backup) method of authentication in case something happens to the primary source device (e.g. Your cell phone is not with you, lost it or you get a new cell phone).