I am level 3! But I know my level increases when I post on forums but how else do I increase my level. Can anyone help!?

Today is the 30th of June and is the day that my membership to Gamespot started. I joined because I am intersted in xbox gaming (FPS and Action/Strategy) and thought that I would join so I can talk to other people that share my interests. LONG LIVE THE XBOX AND XBOX 360!!!! WHOOP! WHOOP! WHOOP!