IntegraMOD

Heya, I have added some code to my site, specifically from this forum: http://www.integramod.com/forum/viewtopic.php?t=3051

Basically it added an Xbox Gamertag field to the board, and it displays your Xbox Gamercard on your posts and on your profile... Everything works perfectly fine, except I can't figure out how to add the field in the ACP under User Admin | User List | Open/Close <User> | Manage

I believe I have to do it under admin_users, but I have no idea where it goes (I'm pretty new to PHP... Well, that's an overstatement, I don't even count as a PHP noob...)
BTW, just so everyone knows, the code in there works perfectly under 1.4.0!

Well, I've been doing some digging and some research, and I think I've narrowed it down to being located in admin/admin_users.php, but before I go editing that file I'm trying to find out exactly where in there the code should go, and exactly what code to use...
I tried playing around with PCP, but it doesn't allow me to add any fields on that particular page... I can add it to every other form page that I need to, but not that one particular one so I can update the information for the users that have been inactive for a while so I can play around with it on our disabled forums to make sure I get it to display the way I want it to when multiple people have their Gamertags entered and post in the same forum (It's taking up a lot of extra room and creating a lot of blank space that I don't want)

*bump*
So can anyone help me so I can modify the field from the User CP? Now that I'm all moved in to my newplace, I need to start playing around with this a bit more so I can tweak it just right,but I would prefer to do it from the admin console then calling everyone and getting their passwords to my web site <img>