How to Use the Coupon of Discount:
Make LOG_IN, make the purchase of the products chosen usually.
In the page Step 2 of 3 - Payment Information, you will find "Discount Coupon." In the part where is written: "Redemption Code", put the suitable code in the offered Coupon.
Now it is only the process that will appear the discount in the final price to continue.
Any doubt enters in counted with us.
Remember to verify the you date from validity of the coupon.