I want to use classifieds with the members mod.

1) When I am setting up the classified ads mod it is asking me to assign a member's role. Since I am am also using the membership mod and have 3 levels of members ( silver, gold, and platinum) what do I choose here? Do I add silver gold and platinum? If so is it case sensitive?

2) I want to be able to allow logged in users to post classifieds for free, but charge non members a flat fee to post. It looks like it can do this out of the box, but what settings do I need to change to accomplish this?