From VEX Wiki
How do I add a new page?
First, navigate to an existing page that you want to link to your new page. For instance, if you want to create a new team page, you might go to this page: [http://www.vexforum.com/wiki/index.php/TeamList]
Second, edit the section of the page that will hold your new link. There are  links to the right of each section name. Also, there is an "edit" tab near the top/center of the page that you can use to edit the whole page (all sections).
Once you are in the editor, you'll see the raw wiki markup language for the section you are editing. To add a link, add some text that looks like:
- [[Name of My New Page]].
If you are adding a link for a new team page, you would add a line that follows the formatting of the other team page links. Something like this:
- *[[Team 2357]] - Prime Robotics
Please take care not to delete or mess up any of the surrounding text when you edit.
Now, click on the "Show preview" button at the bottom of the page to make sure it looks right. If it does, you should click on the "Save page" button.
You should see the page you just edited, now containing your new link. Clicking on that link should take you to your new blank page. Edit and save that page as often as you like.
Where can I find the user guide for the wiki?
Consult the WikiMedia Editing Guide for information on using the wiki software.