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If I understood you correctly, you want to edit prices and add coupon code inside of your payment wizard field. Is this the form you are working on http://www.jotform.com/60318413761956?
Inside of you Form Builder open your payment wizard filed and go to product options.
Simply click on the product and change price of that product. When you change price click on Save Product option.
Inside of that form you do not have coupon code. If you want to add coupon code in the payment form, inside of this guide you can find out how to do it:
Hope this will help. Let us know if you need further assistance.