If you have a Discount coupon code you can apply it at time of checkout.
Once you have added products you want to buy, click on Cart and then Checkout. At Checkout Page on top click on ‘Click here to enter your code‘.
Enter coupon code, in the box and click ‘Apply Coupon’
You will see instantly your discount getting applied to amount on screen. So you can click on Place Order to get done. Happy Shopping 🙂