Promo Code is used as follows: Sign in to Kaseta, select the items you want to buy and add to your cart. Then, click the Calculate button, and finally jump to the payment page, you will see the information of [Select your Coupon], click to select the Coupon Code you want to use, and then return to the payment page to continue to complete the payment. Please note that used Coupon Code will be automatically removed from your coupon.