[Solved] Coupon for products

-- HikaSerial version -- : 2.6.2
-- Joomla version -- : 3.5.1
-- PHP version -- : 5.5.1

I want to create a coupon for products to offer 1 free product on multiple products

Do i need hikaserial to create coupons

What does hikaserial do?

I read the documentation and im still very lost

Can you give me a 1 2 3 on how to get a coupon made

Best regards