Nobody said how because the original poster indicated he already knew, but thought it would be free. From you xbox, press the Guide button -» scroll right twice to settings -» choose profile -» choose edit profile -» choose gamertag. Follow the instructions
and pay 800 MSP.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.