Adding pages yourself is really easy, you can do it through the web, and it is pretty much like using a word processor or simple text editor. Of course, if you know HTML, or one of the common blog formats such as Markdown, Textile or reStructuredText, you can use them instead.
There is a step-by-step guide you can look at, but the first step is to become a member. This is free, and simply a matter of requesting a username and password. Use the Contact page to send us an email.