Instructions
Turn the wireless headsets and Xbox 360 on. If your headsets are not working properly, you may need to charge the headsets with your USB charger.
Press the "Connect" button on the Xbox 360. This button is located to the right of the memory card ports on the front of the console.
Hold the "Connect" button for more than a second. The wireless headsets will self-connect to the first available wireless ports on the Xbox 360.
Connect any other wireless accessories (likely controllers) to the remaining two wireless ports on the Xbox 360.