How to prevent a Membership level from posting a classified

I am looking for a way to only allow one level of membership to post classifieds. At this time I have 4 levels. All others should be able to view classifieds.

I now have it set so subscribers can only view classifieds, however when I login as a subscriber I can post but I cannot select a category. I would like to make it so only a special groups of subscribers (level 3 that I added to classified admin) can post and all other cannot post a classified. I am using buddypress single install