How do seperate the content in my site by levels?

I purchased this plug in and like it so far.But I need to be able to assign to separate levels to my content for two memberships levels. I only want one level to be able to download some items per month and another level to be able to download those items and others per month.How is this done?
Also is there a way to customize the pages that are created when you set them up,I have even created my own pages but it adds text which I would either like to remove or change and customize.
Thank you