(BTW first post)
So, I just bought a cricket broadband modem, to finally upgrade from dial-up, and then bought a belkin wirless g router. First of all the modem connects to my desktop computer. I want to know how to share the connection on the router. I've already asked belkin about it(with no reply).

Too long, and too many variations to deal with here. The instructions vary depending on opeating system, hardware, etc.
Read all your documentation from Belkin, then get documentation from Cricket, then connect the Cricket to the Belkin, or read up on installing a router connection.
This can be very difficult for some folks, so you might want to pick up a basic book on networking an one on ethernet at the library...
There are also a number of full explanations you can find with a Gurgle search which will be enough to get you going.

Thanks, at least I have somewhere to start.