As an instructor, after you have created a page for your course, you can edit the page at any time.
By default, only instructors (teachers) can edit pages. However, you can set a default preference for specific users to edit and contribute to the page in the Course Settings Course Details tab.
In Course Navigation, click the Pages link.
Pages is designed to open to the front page for the course, if there is a front page selected. To select a page from the Pages Index, click the View All Pages button.
Click the title of the page you want to change.
Click the Edit button.
Add content to your page using the Content Selector . Edit the content and add links and media using the Rich Content Editor  or switch to the HTML Editor .
To change the editing permissions for the page, click the Options drop-down menu .
Click the Save button.
View the changes you made to the page.