So, anybody can edit the pages on this thing. Just click on the "Edit Page" link in the lower right corner of the page. If you just want to add some text to the page, just make your changes and then click the "Save" button.

If you remove the spaces from a phrase, and capitalize all the words, it turns into a wiki link. When you look at the page after you edit it, the "wiki word" you just created has a little queston mark after it. Click on the question mark, and you'll go to a page to edit the new link you just created.

Normally, wiki words must be at least two capitalized words squished together (see AlanGreenspan and MrT.) In order to make my name into a wiki, I put doubled curly braces around my name ({{Wadsbone}}.) It's called a free link.

The fancier formatting features are described briefly at the bottom of the editor page. Press the "Preview" button to see what your changes look like without changing the actual page.

Follow the "DocumentationIndex" link under "PmWiki" on the left. It describes how to do everything in there. Or just start making changes; it's not terribly difficult.