1. Copy the discount code of Whataburger you want on the page and click to get code.
2. You will subsequently see the offer code appear and get automatically copied to your clipboard.
3. You'll subsequently have to navigate back to the Whataburger's checkout page, locate the promo code box, and insert the code you just duplicated into it.
4. As a final step, you need to press 'Apply Code' to view the size of the discount on your current order.