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

I was told by mcrosoft that it's possible to do it but they didn't tell me how and I don't wanna call them back cuz most of the ppl there I can barely understand. Can someone tell me how to do this? Thnks.How can you upgrade your gamer profile to an xbox live gamertag?you just make sure you have an internet connection on your xbox then go to JOIN XBOX LIVE it will see if the name on your profile is available to use on xbox live as an gamertag if not you'll have to create a whole new gamertag which will now be your profiles new name after that you fill out your information and your your email address. and if its your first time join xbox live you get 1 month free of xbox live.How can you upgrade your gamer profile to an xbox live gamertag?Guide Button%26gt;Personal Settings%26gt;Edit Gamertag