How do you upgrade your gamer profile to an xbox live gamertag?

microsoft said it's possible. Anyone know how to do it?How do you upgrade your gamer profile to an xbox live gamertag?It is easy, but it has a fee. Go on the marketplace dashboard(all the way to the left) and choose JOIN XBOX LIVE. Good luck and if you have Halo 3, give me your gamertag! Mine is DarkerBirdHow do you upgrade your gamer profile to an xbox live gamertag?you have to pay for its, its $50 for a year subscription, you would go to your gamer profile and click on connect to xbox live then go from there