Questions... If the answer is Yes, or you have tried the instructions, skip to next.
1.) You have already signed up with New TamaTown?
(You gave Email, Have a Site Login UserName, Password and GotchiID for your Character)
2.) You have a Gotchi ID that consist of 2 Letters and 4 Numbers?
(This is not a User Name... is Gotchi ID and is currently Site Only)
3.) While on the Main New Tama Town page, you Log In with the UserName and Password?
(The main page is NOT the same as Log In for your TamaGo. The UserName should also be different from the one on your Tama-Go Unit.)
4.) While logged into New TamaTown you clicked on the Log in option under the GUEST Character Picture?
(Inside the Purple Box, but located just below the Halfway mark.)
5.) You chose TAMA-GO as your version and Not MUSIC STAR
(This is possible where your problem is... Music Star only has 5 Character UserName. Try clicking TAMA-GO instead for more Letter Input.)
I will leave it at these 5, because I think the last one is your problem.
Try all of these steps and let us know if anything does (or does not) fix your problem.
Good Luck and hope everything turns out okay.
~Phnx