[rt-users] config tab

[Rolf Schaufelberger]

Hi,  
I have running rt 4.0 and I don't find, where I have to grant the right to privilegded users to be able to change their settings , which, I assume, means , to see the config tab. 
As root I go to   Configuration-> Global->GroupRights
choose   system->Privileged,  
and I see a  checkbox  "Show Configuration Tab" in the "rights for administrators" tabs, yet not in the  "rights for staff" tab.

But I don't know, what is staff and what are administrators ?

Rolf Schaufelberger