Joomla Menu: To Restrict Access to a Menu Item by User Level
by Pat Fortino
In the Access Level list, select an access level.
Select Registered to restrict the Joomla menu item Registered Users Select Special to restrict the Joomla menu item to all User Groups except Guest and Registered; in other words, to all Joomla Administrator Groups – Editor, Publisher, Manager, Administrator.
Click Save and then test the link to make sure the access restriction is correct.