A Wiki is just like a normal website with links to local pages and links to other websites like http://www.pmwiki.org/.
The menu down the lefthand side lets you jump to particular pages.
A row of action links appear at the top of the page, like this:
- Edit - allows you to edit the page content with your browser (see the the How to edit page)
- History - shows you the various edits that have been made to the page
- All Recent Changes - lists the most recent pages that were changed
A very similar set of buttons appears at the bottom of the page:
You may have access to additional buttons:
- Attach a File - allows you to attach (upload) a file
- Set Attributes - only for admin to use
The editing screen has several controls on it which are demonstrated on the How to edit page.