Um please excuse the other people, as they are a bit retarded.
I completely understand what you are talking about. First make sure your game is registered in Impulse.
Next, simply log in with the same forum user info you used to log into here.
The game is not really clear in how to do all that, as when you click multiplayer->create account->it simply switches to Impulse.
UNLIKE hundreds of other games that actually take you to a registration screen.
THIS!!! If youown a legit copy, in a more simplified manner:
1)go to impulsedriven.com and download impulse.
2)install impulse, during the installation create an account name and password
3)Click the "my games" tab and then the "register product button"
4)Update the game
5)Open ports on you router 6100-6200 udp/tcp
6)Launch the game, click "multiplayer" and use impulse log in account name and password to log in to game.
7)Play away.