if your running winxp/winNT/win2k use
[code:40233]ipconfig [/code:40233]
if your running win9x use
[code:40233]winipcfg[/code:40233]
Type this in a command box . Look at the IP address assigned to your gateway. That is the IP for your router.
Your going to have to read up on forwarding ports or opening port with your router.
Good luck and like Joe stated, check the faq on top and my guides section over at
http://www.MOHadmin.com