You do not need a coupon code to use your points. Once you are logged in and have items in your cart, as you are going through the checkout process a drop-down menu will appear in the left corner once you get to the review & payment screen.  Above the drop down, it says “Use your loyalty points. Select your rewards to redeem.” You can click on the drop down and see what rewards you have available to use on the order. I have attached a picture for your reference.
 

Culture Cash Reward Screen 2020ccdiy