Editing
Editing articles, that is to say adding new and changing existing ones, is basically easy in wiki's. First you need to register (don't forget to give working email) and you are set to start writing or iron typos out of old articles.
Usually there is already an existing template for what you are going to add, they have a frame which all the articles need. E.g. Weapons, shields, armours, Items (things that are mainly used from inventory), projectiles, spells, skills, different quest types, societys and plants all have their own templates, so you can simply copy the needed fields, paste it to the article and fill the fields. After looking through preview (which you should always do before saving), and the article looks ok, write what you did to summary field, hit save and you have contributed!
There are couple main guidelines about how to fill those fields. In 'description' field you should not insert any additional rows, instead it should be all in one long row. The template automagically wordwraps them. When adding anything else and you need a line break, hit the enter once more, so that it has empty line between the two texts. This is a wiki 'languages' syntax to tell the wiki to that you want a real line break.