Hi all, is this for a subscription to be a member of a forum, or a subscription to a topic/forum please?
it's not that it actually makes you a member of a forum, that is more or less for users of a forum to donate to your site, you can make them a donator for 30 days or so of a special group. try it as a bbcode and see exactly what the paypal site tells you once you click on the paypal button!