The Site Setup page contains the main configuration for the site. You can configure:
Users in the Site Admin group can:
By default, the Class Site Admin group only contains the Site Owner who created the site. This user can add others to the group. All users in this group have the same privledges as the site owner.
Users who are not Site Admins can:
The sidebar is a global setting for your site. Changes to this sidebar will be seen by all users. You can add, remove, or re-order pages on the sidebar. Only Class Site Admins can remove and reorder pages on the sidebar.
Site Admins can change the security on a page once it has been created. Pages that can be protected have a permissions button in the upper right corner of the page. Remember ClassHome is only editable by Site Admins so you don't need to change permissions on this page.

This gives a Site Admin access to the permissions dialog which allows them to restrict editing to only the admin group.
