How to use loyalty points/rewards
This link will give you a better idea of how the system works:
Select the reward amount of your choice. You'll receive a code that you can use on the last page during your checkout process. The longer you wait to accumulate and then redeem, the better discount value you receive.
Keep in mind you can not use these towards auto-ship purchases at this time. One discount code per transaction. (when you use the rewards codes, you will need to pay for shipping on those orders unless the amount is above $99 free standard shipping threshold.) The points do not expire.