Create A Forum - Support Forums

Hi there,
I am new here and learning my way through setting up my new forum. I figured out the boards and categories and how to make someone a Moderator. I read the "Safeguard your forum" carefully and want to do things right. ;-)
I set the permissions for the different levels but each time I log back in they are reset back to higher number permissions. I have done it FOUR times now and just now it's reverted back. I click "Save" when I'm done on that page so I don't know where I went wrong.
I searched in the help topics here but didn't see this question or somehow missed it, if it exists already.
Thanks!
MJ