Hi,
This means your course is set to be manually evaluated. In this case you'll have to go to the course admin->submissions->course submissions, and then get the pending evaluations and then evaluate the course and provide the marks to the student.
Refer:
http://prntscr.com/hjp68d
If you want this to be auto evaluated then edit the course and in settings section set the course evaluation mode to automatic.
Now the course will be set as finished, now the student can click on the finish course button and access the course.