1) Check the points
If you have any point by hand, please refer to My Account to see how many points you can use.
2) Use the points for your order
When there's any point in your account, it will be shown in the "Place Order" Page, then you can choose how many points to pay for the order. It will be used for the order when you Click the Place Order button. Just as follows:
Terms & Conditions please check here.