Register Rights

Hi friends, I'm planning to use XWiki on a lab as a Documentation Tool. The Access to the Wiki would be restricted... so, people could only be added by an Administrator. By default, anyone who clicks on Register link on XWiki main page can Register itself. I tryed to change the Acess Rights of the Register Page (I`ve added XWikiAdminGroup with full acess to Register Page and XWikiGuess Denyed), but nothing changed... anyone can still register anyperson. I've already tried many things on AcessRights but I'm not able to see what's the problem. The rights on Register Page seems to never change. I really need to restrict the rights on Register Pages. May anyone, please, help me? cheers Jonas. -- JONAS FURTADO DIAS