If you need to add the supply fee. Follow this steps:
1. Select your tution. And then click "add to cart"
2. You will be redirected to the Paypal site. There, please click on "continue shopping".
3. You will be redirected again to our website. Please select the supply fee option, and click again on "add to cart".
4.On the Paypal site, you'll see both items added on your cart.