Authors can create and edit the Overview for a course to tell learners what to expect for that course.

When you are in the main course editing view, head to Overview.

Review the existing overview, then type into the text box and/or use the toolbar to edit the content as needed.

When you're finished, select the green down arrow to save and continue.

Remember, you will need to Publish the course (last item in the left menu) if you want these changes to be immediately visible to live classes using this course.

Not at all. You should review the existing overview to make sure all the details fit how you will be using and supporting the course (especially any assessment details). But if it is all correct, you are not required to change it.

In iQualify people with manage access can create class activations (where you set up dates, learners, facilitators etc. for the class). Classes are linked to courses for all content, but they're their own distinct thing (see A guide to courses and classes in iQualify for an explanation of the distinction between a course and a class).

While the overview can be edited for all classes by the course author editing the "base" course, the overview for a particular class can also be edited by a manage user. See Editing the details of a class activation for detail on all the details that can be updated for a particular class.