module installation help

Hi all,

I need some help getting the installation setup, I think I'm in the right place.

I've installed Drupal fine, and Ive installed Gallery2 inside it fine... but I can't get the module to appear in the Administration bit of Drupal...

Drupal: http://randalstownprimary.com/testsite/
Gallery2: http://randalstownprimary.com/testsite/gallery2/main.php

Can someone give me an idiots guide ;) to getting the module to work?

Thanks
Tony