I know I mentioned it at one point. I myself am still level 7, so I can't tell you how to do it, but it's on the "Permissions" link. That tells you what each level can do.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.