Hi @LIELLEAVITAL ...
I think you're going to need to reach out to your instructor to ask about the code. Canvas Community members do not have access to your school's Canvas environment or any of your courses to be able to help you determine where to use this code. You can contact your instructor directly in Canvas by following the steps in this Guide:
How do I get help with Canvas as a student?
If you aren't able to talk with your instructor, try reaching out to your school's Online Learning / eLearning / Distance Education team, and they should be able to help. As a last resort, maybe someone at the bookstore could help, too. Or, maybe even the book publisher.
Good luck to you!