I just got a wireless router, and I went to host a game on B.net. I noticed no one joined for quite a bit. I dont think I can host. What is up with that?

Check to make sure your ports are open. If you changed routers, its more than likely that they aren't....

I do i check that?

Do you mean how?

Google (Not to be an a**hole, I just don't feel like listing the steps)

http://www.portforward.com/