You have most probably cashed your points. If you have not placed an order yet, the option to use the discount amount can still be done when you are at the checkout page. You still have your points, but just as a valued amount instead.
When you place your next order, please go to the ''Loyalty Program' widget at the bottom right of the page. Click on ''use'' to apply the discount to your cart. A code will appear for you to apply at checkout.