If you have a coupon code you'd like to you on leads in inventory, first build up your shopping cart.
Once you've built the cart and you're ready to checkout, click on the CART in the top right corner.
Under your list of leads click on "Apply a Coupon Code or Voucher Code"
*Don't forget to hit apply and check your totals to ensure that the code has applied as expected. Order that fail to confirm the discount has been applied will not be refunded.