Things You'll Need
Instructions
Turn on the Xbox 360 by pressing the large circular power button on the front of the console. Wait for the system to fully power up before moving on. You will know that power up is complete when the Xbox dashboard is shown on your TV screen.
Press the Xbox button on Xbox the controller to bring up the sign-in menu. The Xbox button is the silver and green button in the very center of the controller that has the Xbox logo on it. Select "Sign In" from the menu that appears, and enter your user name and password when prompted.
Insert the Halo Reach game disc into the Xbox 360 disc drive. Wait for the Xbox 360 to read and recognize the game disc before processing. You will know that the Xbox 360 has completed this step when the Halo Reach splash screen appears on your TV.
Press the A (green) button on the Xbox 360 controller to launch the Halo Reach software. It may take up to 30 seconds for this process to be completed.
Select "multiplayer" from the main Halo Reach menu. This will bring up a list of Halo Reach game modes that can be played online, as well as a brief description for each. Simply move the directional pad the select the game mode that you wish to play, then press A to be automatically connected to a server which is running that game type.