You find these settings in the Backend -> Components -> Kunena Forum -> Options
User Group Super Users has access to:
User Group Administrator has access to: Access Administration Interface
All other user groups have no access!
These settings should not be changed! Unless, you want to create a own Administrator group only for Kunena (see Admins only for Kunena).
Found
errors?
Think
you
can
improve
this
documentation?
edit
this
page