Yes, if you havent signed up for the campaign you need to register. You'll be assigned a team and we recomend you attend the weekly strat meetings (Thursdays for Allies, Fridays for Axis). Im not sure if you can attend tonight's realism due to enlisting so late, but blue will be sure to swoop in and clarify for you.
Here is the registration link: http://www.edge-gamers.com/forums/showthread.php?t=217143