I can't use my new user coupon.

You need to register through the New User Coupon banner to receive the coupon. The coupon will be automatically added to your account, and you can select it on the checkout page when making your purchase.

Please make sure to log in to the account using the email address you used to register.

The new user coupon is valid for 48 hours after registration. Please note that it cannot be used after the 48-hour period has passed.