[Zope] Where did the add users button go?

Hello all.. Its been awhile since I have added a new user, and now I need to add one.. But...when looking, the add users button is gone.. So basically, I'm at a loss to figure out where the add user button in my various acl_users folders is. Is this a bug or a feature? I've tried logging in as myself (the owner of all of the site, Zope-wise) as well as as superuser and that doesn't change anything.. The buttons are gone in both of the Zopes I am using.. This must be a very simple thing.. what am I doing wrong? Am I looking in the wrong place? Zope versions are 2.2.4 and 2.3.3 TIA, Chris