Already registered? You have arrived at the registration screen again because you are attempting to create a new FollowMyHealth® Universal Health Record through a different authentication method (Apple, Facebook, Google, Yahoo, or LiveID) than your original account. Try another known login to see if that will pass you through to your existing FollowMyHealth UHR.
Once into your record, you can add a new authentication method so that you can log in with any of your known username/passwords. See Add Authentication Method for help on this matter.