Is there a way to make this show up only in certain forums within my site?

Try:
That might work, for multiple forums I think you would have to use an array. Which I'm not exactly sure how to code.

Hi I added this mod to my site but only admins can display there gamertag in the forum. How do I get it to where all members can display there's?

All users should be able to add there gamertag via there profile. If you've followed the directions in setting up the profile field correctly you should have no problems.

great code CHU, it works fine at my forum. if you ever find a way to resize the box or display this box in the member's profile page, please let me know. thanks heaps!

If your wanting to resize, I would use Lag's suggestion early in this thread. As for the member profile page, what vB version are you using and where do you want it to be displayed?

Does this work for 3.7.1?

where do i have to add the code? can somebody post it here please?

Has anyone found a way to just isolate the gamerscore? I don't need a gamercard, just the score.

There's no reason it shouldn't

ACP -> Styles & Templates -> Postbit or Postbit Legacy(depending on which you use)