The "audio" comes through the RED and WHITE plugs, the video is called component video and hooks up with "y", "pr", and "pb" these will correspond with the component inputs on your TV.
Depending on the receiver, you may have component switching and can hook it up through the rec.
Well I understand how the plugs go, its just that I already have the vcr, dvd player, and cable box hooked up to the reciever and i cant figure out how to put the xbox in with all the other peripherals.