On PC devices(smartphones)

 1.Add to cart——Checkout——Show order summary——Paste discount code——Contact information——Shipping address——Continue to shipping——Continue to payment——Fill payment——Billing address——Pay now

2.Add to cart——Checkout——Contact information——Shipping address——Continue to shipping——Continue to payment——Paste discount code——Fill payment——Billing address——Pay now

On desktop devices(Computer/Tablets)

 1.Add to cart——Checkout——Contact information——Shipping address——Paste discount code——Continue to shipping——Continue to payment——Fill payment——Billing address——Pay now

 Please copy the discount code on the product page first, then you can paste it at checkout.