IF YOU ARE ACCESSING THE WEBSITE WITH A MOBILE DEVICE
After you click the CHECKOUT button, click the SHOW ORDER SUMMARY link. Enter your discount code in the corresponding field and click the BLUE ARROW button to apply the discount.
IF YOU ARE ACCESSING THE WEBSITE WITH A DESKTOP COMPUTER
After you click the CHECKOUT button, you can enter your discount code in the field that you can find on the right column of the checkout screen. Click the APPLY button after you enter it.