Instructions
Insert the USB flash drive into a USB port on your Xbox 360 console.
Press the "Xbox Guide" button on your controller to turn on your Xbox 360.
Navigate to the "My Xbox" menu and then select the "System Settings" panel by pressing the "A" button on your controller.
Scroll to the "Memory" option, and then press "A" to select it.
Select the "MU" option by pressing the "A" button.
Scroll to "Gamer Profiles," and then press "A" to select it.
Press "A" to select the Gamertag you want to put on your USB flash drive.
Press "A" to select the "Copy" option, and then press "A" to select your USB flash drive.