I've never edited a wiki before this one either. There are some wiki-formatting things, but those are explained in a table on the help section, and a couple of fanlore specific templates, but for the most part you just sign in (I do it with Open ID because I didn't want to memorize yet another password), click on an "edit" link for an article and add somethingyou feel is missing. Making new ones is easy too, whenever you search for something and the term doesn't have an entry yet it offers you to create it. Of course skimming the "about fanlore" section for policies helps too, but it is uncomplicated.