- last post: 01.01.0001 12:00 AM PDT
This gamertag is only if you have Xbox Live. If you don't have XBL subscription, you don't have a gamertag.
If you do have subscription, you should see a prompt somewhere saying to link your gamertag, follow the instructions. It should involve busting out the credit card you used to activate XBL. I'm not sure if you have to link your gamertag to your .net account through the Xbox live official website first though, that's just the way I did it.