To edit content, click on the 'Edit' button at either the top or bottom of any page and you will see how the pages are constructed. Simply add new text and click 'Preview' then (if it looks okay) click on 'Save'. Creating new pages happens automatically whenever you write a new (i.e. currently unused) WikiWord. This is denoted by a ? after the word - clicking on the ? creates the new WikiWord (also known as a 'topic').
Please feel free to correct any mistakes, and to add new information (using GoodStyle of course)!