The discount code is applied in the page of Secure checkout payment options, the process is as follows:
1. Add products to your shopping cart.
2. In the page of your shopping cart, click on Proceed to checkout
3. In the page Secure checkout login enters as an existing user or register as a new customer
4. In the page Secure checkout payment options here register your code and select the payment method.
! CONGRATULATIONS YOU HAVE YOUR DISCOUNT!