You'll find the promo code box on the Checkout page. Input the code and click "Apply" you'll see the discount applied immediately.
Know that promo codes need to be in upper-case letters. Only one code can be applied per order, as discounts cannot be combined with other discount codes or applied toward sales/promotional items.
If a code isn't working for you, contact Caliva Customer Support by either calling our team at 888-688-0303 or reaching out to us via our online chat option using the chat button in the bottom right-hand corner of our website.