Once I publish my Quiz, how do I make additional changes?
Once you publish a quiz and make it available to your students, you can make changes to the quiz. However, students who have already opened or completed the quiz will not see any changes you make, which may affect their grades. If necessary, you can use quiz regrade to edit certain types of quizzes, or you can add fudge points to individual student quiz scores using SpeedGrader. You can also moderate the quiz to give additional attempts.
Click the Settings icon  and click the Edit link for the quiz you want to change.
View Warning Message
If one of your students has opened or has already taken the quiz, you will see a warning notification at the top of the quiz. If you change the quiz contents, you will need to either grant them permission to retake the quiz, or you can regrade the quiz to compensate for any changes. You can also add fudge points to individual student quiz scores using SpeedGrader.
Edit Quiz Questions
To edit quiz questions, click the Questions tab.
To notify the students in your course that the quiz has changed, select the Notify users this quiz has changed check box. Note that students will always receive a notification if you change the due date of the quiz regardless of whether you select this check box.
Save It Now
If you exit the quiz without saving, Canvas will ask you to save your changes when you return to the quiz. To update your changes, click the Save It Now button.