How do I edit a course page as an observer?
If an instructor allows observers to edit course pages, you can edit a page in a course.
To format text and embed external links, YouTube Videos, and Flickr images, use the Rich Content Editor . To gain access to all publicly available Files and Images from course Files, click the Content Selector  in the Sidebar. You can also quickly link to existing pages and past Discussions. When you are finished editing the Page, click the Save button . Canvas saves a new version of the page each time a user saves, so no changes will ever be lost.