Editing pages in the OpenOffice.org Wiki is fairly easy once you understand how a Wiki works.
For documentation and examples showing the most frequently used Wiki markup, please read the MediaWiki documentation:
The OOo Documentation project's Wiki Editing Policy, has some nice information explaining how to do some of the general editing tasks.
The OpenOffice.org Wiki has a WYSIWYG Editor available. You must enable it to use it. See Help:FCKeditor.
Many extensions are installed in the Wiki to help with editing and building Wiki content. See Help:Extensions.