JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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Before anything else, I highly recommend you create your JotForm account first. You can use this link to do this http://www.jotform.com/signup
You can use your email account to signup.
As to your question, please check this user guide also
You can use the Coupon code in the Payment form to implement a discount/promo code.
Hope this help. Inform us if you need further assistance.