[Zope] Kupu and Zope2

Hello, I want to use kupu 1.3,.5 with Zope 2.7.3 (Python 2.3.4), but I'm stuck in the given example. It seems not work: Following the steps in the example.pt and then calling http://localhost:8080/testsite/test_html/edit_kupu (test_html is of type ZPT and pure html) shows only the html, nothing else. I then tried to fill the slot in the fulleditor macro <metal:slot fill-slot="editorframe"> <iframe class="kupu-editor-iframe" id="kupu-editor" frameborder="0" scrolling="auto" src="fulldoc" tal:attributes="src document_url"> </iframe> </metal:slot> but that doesn't work as well. Does anybody has a working example how to use kupu. Thanks in advance Regards Thomas Adams