You must publish a course before students can access it and its contents.
Even if every item within your course is published, those items will not be visible to students until the course itself is published! Similarly, you cannot message or send announcements to students until the course is published.
You can publish your course in the Course Home Page sidebar
In Global Navigation, click the Courses link , then click the name of the course .
In the Sidebar, click the Publish button.
Note: On smaller screens, the Sidebar displays beneath Course Home Page content.