After selecting the course/class you wish to purchase, you will be sent to a checkout page. You will need to log in or enter your information.

Do NOT click the Complete Purchase button at this time.

You will also see a link that asks "Have a coupon?" Click it.
You will type the coupon code in the box.

Then you will click Apply. At this point, your purchase price should reflect the discounted cost.

Now, you can click the Complete purchase button.