Wanted to have Elevated privilages with su

from a normal user you wanted to switch to be a super user and at time you may find the su says sorry
Ok the issue is the current logged in user is not a member of wheel group.
Add the user to the wheel group by issueing the following command as root
#pw usermod -g wheel
eg. #pw usermod testuser -g wheel
Now try to login as the user and try to issue su, it must work now
So thats another tip I learned and sharing with you

Babs