First, confirm whether you have an account in HDpiano. If not, you can create it first. Then select your favorite HDpiano product and add it to the shopping cart. Click the calculated button, and finally, jump to the HDpiano payment page. After clicking, you can select the HDpiano Coupon Code you need to use, and then return to the payment page to continue the payment. It should be noted that the used HDpiano Coupon will be automatically removed from your Promo Code.