Feel free to browse by clicking page links, starting from the home page. It should be quite self-explanatory. If you're looking for specific information, you can use the search bar on the top right, or the sidebar on the left.

Editing is quite easy: if you have the access, just hover over the pencil. “Edit this page” will show up. Click it, and you'll see the editing menu. Making text changes is as straightforward as expected. For lay-out, lists, and other tricks, read more on the Formatting Syntax page.