Hey xARCADIUMx, you need to:
1) change your gamertag on here http://www.xiledgaming.com/forum/profile.php?do=editprofile
2) change your login information for xg.com http://www.xiledgaming.com/forum/profile.php?do=requestusername
1) change your gamertag on here http://www.xiledgaming.com/forum/profile.php?do=editprofile
2) change your login information for xg.com http://www.xiledgaming.com/forum/profile.php?do=requestusername