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