[Zope] ZDiscussion How does one use this??

Hi, I am new to Zope and am struggling a bit... I downloaded ZDiscussion 0.2.0, extracted it to the correct place and imported the additional zclass (whatever that is, none of the docs explains this). I can add a new ZDiscussion fine, but what than?? It seems like that's an empty folder with some special tabs, but how do I use the discusion??? Furthermore, where is a documentation that tells about that? The ReadMe only covers the DropIn replacment for Confera. Is ZDiscussion just the basis for a product like ZDConfera? If so, where are the features like Preview??? Regards Jochen