I was trying to update my acct info and put my location etc...when I try to save it says user name too long? I haven't picked a user name. It just shows my real name. I have looked over and over and cannot find a place to choose a name. Help!

Did you link to a facebook account? If so, it uses your name from fb. I believe that is the only time it updates your username. I am not sure if it picks up your name if you only link to google on android or game center on ios.

Yes I logged in from fb. I set a password after that but still couldn't change anything.