SnapID™ two-step login is a patented two-factor authentication process. Click here to watch an instructional video on two-step authentication:https://vimeo.com/158143690
As the name implies it involves two steps.
Step-1: You login with your username and password.
Step-2: Once you click on the login button and the username and password are authenticated, a message will popup asking you to Text a code to a number. Follow the instructions.
If the code you sent matches the code displayed on the webpage and if it came from your registered phone number (the phone number you used to Join SnapID™) you will be logged in.