@StacyL ...

I believe the instructor will need to go into the SpeedGrader for each student for this quiz.  Then, the instructor will need to scroll down to the very bottom of the screen below the questions displayed in the SpeedGrader and click on the "Update Scores" or "Update" button.  Of course, the instructor should also double-check the questions to make sure the students answered the questions correctly before updating the scores.

Let us know if that helps.