Hi Joachim, It's best to ask for help on the users list so that others can benefit from the answer. Did you managed to install the extension? See http://extensions.xwiki.org/xwiki/bin/view/Extension/Extension+Manager+Appl… if you have trouble. Note that if you're using XWiki 5.0M2 best is to install (or upgrade to) version 1.0.2 of the Diagram Application. After the extension is installed go to your home page and you should see a "Diagram" link in the Applications panel. Follow the link. On the Diagram Application home page there is a small panel with a "Add new entry" link which lets you create new diagrams. You can then include the created diagrams in other pages, if you wish, using the display macro http://extensions.xwiki.org/xwiki/bin/view/Extension/Display+Macro . Hope this helps, Marius On Fri, Apr 12, 2013 at 2:11 PM, <joachim(a)mund-online.de> wrote: