You need to follow the steps below to use your Promo Code in NovelKeys: add your favorite products to the shopping cart, then click log in or create a new account, and then return to the NovelKeys shopping cart to select the products you need to purchase (can be a single product, multiple NovelKeys orders can also be placed together). Then jump to the payment page, select Coupon Code of your NovelKeys on the payment page, and complete the payment.