S4 Gamecoach Register Pack [Need Help]

[Kojinko]

http://www.gamecoach.tv/en/register/s4-league

This like is it

when i put username : This login name is already taken.
Please choose a different login name. This is already taken.

when i put email : This e-mail address is already taken.
If you have already played one of the following games, all you need to do is log in — there is no need to register again!
DC Universe Online
PlanetSide 2
Maestia
Florensia
Audition
Have you forgotten your login name or your password?

i can't register... and i try hard try any thing but still not work Please help tut me how too... please