From the main page of your class site, click on the "Class Wikis" icon or link.
The main class wikis page lists all current wikis, with each title functioning as a link to that specific class wiki. From this page, you can also create a new wiki or change the display order of the current wikis.
The "Manage" menu on a class wiki page gives you access to "Create a New Page" or "Manage the Wiki."
The "Manage the Wiki" main page includes sections that allow you to work with the wiki info, current page content, files, media, pages, appearance and a set of advanced options.