Log in to your account. (Login Here)
Once you're logged in, locate the "Rewards" button on the left-hand side.
Click on the "Redeem Points" option.
Based on the number of available points you have, click on the "Get Reward" button.
You will be presented with a promo code; make sure to copy it.
When you're ready to make a purchase, proceed to the checkout page and enter the copied promo code in the designated field to apply the discount.