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.
I checked the form on your account (http://www.jotform.us/form/62727277080156) and it looks like you already have multiple products on the stripe integration.
If you want to add more products, simply open the Stripe payment wizard and click the Create New Product button.
For more information about the Stripe integration, you may also check out this guide: How to Integrate Stripe with your Form
Please let us know if you need further assistance.