You can do this on the checkout page.

  1. Enter your email address.
  2. Select the Promo code checkbox.
  3. Type in the code, then click Apply

  4. If the code was for a free copy, you will be able to complete the purchase and watch it immediately. If the code was for a discount, you will need to enter your payment info to complete the payment.

Please note that at this time, coupons can only be redeemed if you’re paying in USD.