Whether you can see intructor feedback on your quiz depends on the following factors:
A. The instructor has to have set up a "submission view" which defines what a student can see. The default submission view only shows the score and not any feedback or questions.
B. The quiz needs to be graded.
If the quiz has been graded and a submission view set up, you can access the feedback through the following steps:
1. Go to quizzes and click on the downware pointing arrow next to the quiz name and select "Submissions".
2. Click on the the Attempt. If your quiz was set up for multiple attempts, you may have more than 1 attempt that you can view.