This software should have an option to generate a signup code aswell as the signup page, that would make integration very easy, right now, unless you pay for a cms integration, have knowledge of coding or are happy with iframes, other than that your stuffed basically.
@maverick01: couple of things: 1) consider view count includes both actual human readers as well as bots, so that is not necessarily indicative of a true number of individuals that have read your post. 2) Have you looked at v4 alpha yet: http://www.amember.com/forum/showthread.php?t=14283 Among the new features include a signup page builder as well as "shopping cart" functionality, which may satisfy your needs.