From CSS Discuss
This Wiki runs on MediaWiki.
Eventually, I suppose some knowledgeable folks will add our own instructions here on how to edit this wiki. Until that happens, the user documentation can be found at the MediaWiki web site. Additionally, a link to the MediaWiki site can also be found at the extreme bottom right corner of any page in this wiki.
Once on their site look in the left hand column, right beneath the search block, and you will find the support group of links and the User help is the first link to be found there.