If you have saved your registration mail, this is no problem. Apart from your login data, it also contains the server info.
If you didn't save the registration mail, you you can request a new password via the following link:
http://en.upjers.com/passwordresend
As your account is valid both for the game as well as for our portal, you can retrieve a new password for both your GarbageGarage as well as the Portal account by copy/pasting this URL into your browser's address bar, entering your email-address in the newly opened window and clicking on "Send".
You can also try to log in on every server using the trial-and-error method until you have found your game server. Unfortunately, these are the only options.