if you want to do an IP game:
1, Go to Mulitplayer and from the drop down menu on the top left select "TCP/IP"
2, Click on host, on the screen that comes up you dont have to change and options but you can if you want, then just click host (i think thats what it says
) in the bottom right of the screen.
If you want to find out what your IP is so that you can give it to other people just click the "Get IP" button. If you want to copy/paste it use the Ctrl+C method.
If ya wanna join an IP game do step 1 but click on "search" then highlight the game that shows in the window and click "Join"