You can create Coupons as much as you want. To create new coupon just go to Dashboard > Directory Pro > Coupon
You can add all the details that needs to add a new coupon. You can add the expire date, amount. You have the choice to add the discount as percentage or fixed amount. For more instruction see the video in video section.
The users will use the coupon while sing up. Just click on HAVE A COUPON button and enter the coupon code.