[Mailman-Users] Authorization problem

[Tim Ferguson]

I've just set up our first Mailman and when trying to create a new mailing list, other than the initial list, I'm receiving the message: Error: You are not authorized to create new mailing lists
I'm stumped as the only password I've entered so far is the site administrator's password.  Any ideas or suggestions would be greatly appreciated.
 
Thanks,
 
Tim