I am now trying to use the discount feature for the first time. I want to offer a 20% discount on several select items for a limited time. As far as I can tell I have entered all of the necessary information, but the discount is not showing up. My suspicion is when I am selecting product to include. I click on a specific product from the list, a thumbnail of that product shows up to the left of the list, but nothing really happens to show me that the discount is being applied to that product. Am I doing something wrong?