Coupons will occasionally be offered. Enter them in the shopping cart if you meet the criteria.
Here you can find the steps on using your discount coupon.
Step 1: Start the checkout process
Step 2: Select the shipping method for your order.
Step 3: Select the payment method you preferred. In this step, you can enter the coupon code at the "Discount Coupon" section.
Step 4: Review order. Here you can check all the details including the shipping method, shipping fee, total cost of this order. You can notice the change in total cost/shipping fee upon using the discount coupon.