Instructions
Select "Xbox Live" from the main menu of "Forza Motorsport 2."
Select either an Exhibition Race or a Career Race. An Exhibition Race is one race against other human players. A Career Race allows you to play multiple races against other humans to earn credits and improve your driver rating if you win.
Select Quick Match, Custom Match or Create-a-Match. Custom Match allows you to set various parameters for the match you want to join, such as a specific track or car set. Quick Match joins you to the first available match it finds -- no parameters are used. Create-a-Match allows you to host your own "Forza Motorsport 2" match.
Select a car. Depending on what the host has selected, you might be able to choose any car, or you might have to select a car from a limited, predetermined list.
Play the game the same way you would in single-player mode and attempt to win the race by placing first.