Tutorial:
1. First what you want to do is put in your USB with the GamerTag you want to mod on it.
2. Now open USB Explorer and open device then click: content > E00000(any numbers are here) > FFE07D1 > 0001000 > E00000(any numbers are here).
3. Click on the very last one which will be your profile, extract it to the desktop.
4. Now open up "Hadzz GT Editor" and choose your profile.
5. Time for the fun part, mod your name. If you want to add color to it put your cursor in front of the bit you want colored and click colors and choose what one. All the controller buttons show up as different characters but don't worry. Also the A button's symbol is invisible but it is fine when in game. You can also make your GamerTag invisible by ticking "Invisible GamerTag" under others.
6. Choose your profile number. The one you want to choose is one you havent used before. So if you have a profile ending with an A, choose something apart from A. You will have to choose a different one everytime you make another modded account.
7. Click file save and choose your destination. I suggest the desktop.
It will create a new folder on the desktop, to find it just look for a profile ending with the profile number you chose.
8. Open up the modded folder to the very end, which will be another profile.
9. Open up Modio and drag the modded profile into Modio and click rehash and resign.
10. Drag the modded profile folder into content.
11. Safely Remove your USB and plug it into your XBox.
not my vid but here ya go
https://www.youtube.com/watch?v=NmgQKFYYYWg&feature=player_embedded