Step one is to go into your manager dashboard.
Next click the activities tab.
It will now show each course, as well as how many users are registered for the course. Now click the green users button to see the details about a specific course.
Inside a course activity report you can see who did not complete a course, and also run detailed reports on this data by clicking the export button.
From this activity report screen you will also be able to register other users to that specific course by clicking the register others button.