You need a Novaworld2 account to play online.
You need to create a NovaWorld2 account using CD key email etc this should happen during setup with a promt for you to register the game as far as I know if this fails
goto
http://www.novaworld2.com to register the game.
Seeing you are here on NHQ everything should work out.
Use the same info you used to create your account here. To create your Novaworld2 account
Unfortunately without a NW2 account the servers are unavailable to your game.