If you have not logged on to the website, the first thing you should do is log in with your customer account.
Go to your account
Click on the top right, on your behalf, and access your account.
Click on the item "My loyalty points."
Appear all orders you have made and the points that you added to make your purchases. Click on the button "Transform my points in a voucher of X€" to redeem your points.
In the "My loyalty points Vouchers" list all vouchers discounts you redeem points and status, the status indicates whether it has already been used or you can use on your next purchase will appear.
In your next purchase during the checkout process, you will see a list of your vouchers for use. You just add the discount code in the box and click the "Add" button to take advantage of your discount.