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

i called microsoft and confirmed this is possible. they diint tell me how to do it tho. so how do you do it?How do you upgrade your gamer profile to an xbox live gamertag?Go to your dashboard and go to market place, there should be a icon that says join xbox live. You will need a windows live id or you can use your hotmail email account to register, I'm not sure if you need a credit/debit card as well for the register but you will get a month free gold access.How do you upgrade your gamer profile to an xbox live gamertag?you have to get xbox live.