Luckily, when you enroll in a MasterClass you will always have access to the instructor's guide. When you sign in to your account and go to your class you should see the lesson plan. At the bottom of the lesson plan you should be able to access the instructor's guide and be able to return to it whenever you want.
If for some reason the instructor's guide isn't appearing you can submit a request here and our support team will help you out!