It sends you an email when you sign up, and you have to validate it to remove the "Not Registered".
TH will "Register" you, if you asked.
As for CUSTOM titles, you get that when you become a special member, which you'll get if you stick around and has as fun conversations as we have been having in the story of Warcraft thread.
The address you put in as your email address when you registered. I wouldn't really worry about it. The Helper will 'Register" you tomorrow if you haven't gotten the email.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.