Things You'll Need
Instructions
Save gamertag to USB
Plug the USB flash drive into the console.
Go to My Xbox and use the A button to select System Settings>Memory>All Devices.
Choose "Gamer Profiles" and highlight your profile, then press the A button to select.
Select "Move" and then highlight your USB drive from the list. Press A. Your profile is now saved to the USB drive and you can plug it into another console to use your gamertag.