Access this feature by clicking on the icon or link located on your class site's main page.
Click the "Create a Wiki" link on the main Class Wikis page.
On the resulting page, enter the class wiki's title, description, and main page text. To complete the process, click the "Create Wiki" button at the bottom of the page.
Once you've created a wiki, you can add pages and files and customize its appearance; as can anyone in the class.