How can I edit the membership-page?

I would like to have the "site.membercounter"-macro included in my membership page (where subscribers and contributors are listed), but I can't find out how to make changes there. My first guess was something like "xyz.antville.org" but, guess what, it did not work out. Is there a skin that controls the look of the page or do I have to insert the macro somewhere else (which would be illogical to me and btw been taken for vanity…)