JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You can change details of your product by navigating to the "Payment Wizard: Products" section.
You can change the name, price, add images and custom properties to your product.
To learn more about Purchase Order Forms or Payment Forms, I would like to suggest that you visit this section of our User Guide, Payment Forms Tutorial.
I hope this helps. Let us know if you need further assistance on this.