[xwiki-users] XWiki Enterprise Manager 4.5.1: Editing a user profile

Hello I have just set up XWiki Enterprise Manager 4.5.1 and installed the Administration application. I logged in and went to the "Administration: Users" page. However, when I click on the "Edit" icon to edit a user profile, the popup area that appears doesn't show any fields. It just says "For more options to edit this user, please go to the user's profile" and there is a "Save" and "Cancel" button. There is supposed to be a lot more here. I think that I'm missing an extension. Does anyone know what I need to do? Thank you. Naoufel