What is Coupon Code?
A Coupon Code is Computer Generated Code that Offers a Discount on (Online/Offline) Purchases.
Click on Left Navigation Menu and Select Settings.
Click on Add-ons.
Select Coupon Code

Click on "+New Coupon Code " to Create New Coupon

After Clicking on "+New Coupon Code" you can See Create Coupon Code Format.
You have to fill all the Details in the Mentioned form and Save to Create New Coupon Code.  

After Clicking "Save" You Will See your List of Coupons Code Here

From List of Coupons Code you can View / Edit / Delete your Coupon.