Things You'll Need
Instructions
Turn on your Xbox 360 console and wait for the console menu to load.
Highlight your gamertag information under the "My Xbox" menu and press the "A" button.
Select "Change Gamertag" and press the "A" button. Highlight "Enter New Gamertag" and press "A" again.
Modify your gamertag with the virtual keyboard that appears. Press "Start" when you are finished.
Select "Yes, use this Gamertag" and press the "A" button to confirm your modifications and pay the fee to change it.