Your discount does not show in the cart page.
For the discount to be applied, type your coupon code in the « ❗️Enter your discount code here ❗️» field at checkout and click on « Apply » to apply it immediately. Your discount will show in the subtotal.
If the coupon code is already automatically entered for you, then you do not have anything to do. In the picture below, a SUB5 coupon code was already automatically applied on the checkout page.
Only one coupon code can be used at a time.
Photo of the first checkout page.