Information on creating and editing pages can be found here on the MediaWiki site:

Don't be afraid, it's really easy. The easiest way to create a new page is:

  • Find a page that looks like the one you want to make.
  • Click "Edit" at the top.
  • Copy the contents of the edit window, and click "Cancel" at the bottom.
  • Go to the page you want to create and click "edit this page".
  • Paste the old page, and edit it as you like.
  • Be sure to preview your changes, then click "Save page".
  • That's it!