Being new to the site I have successfully loaded pages, changed the Logo and so on, but cannot see what "Special Pages" are or how to create them if needed.
The special pages are used by the system for pages that are returned in specific cases. In this instance the "not found" page that you have, is returned if a user types in the URL of your site but does not correctly type in the address of one of your pages.
Under normal conditions there is no need for the user to create or edit the special pages. However, if you'd like your users to see a specific piece of content when they enter a URL incorrectly you can modify this page.
Cambridge Open Systems' support team