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.
Thankyou for contacting us, also for the link you provided, we've checked your issue, and successfully reproduce the error, could you read our guide section on Adding Form to Shopify Store Frontpage.
Do let us know if you still having issues on displaying a form to your Shopify store, we would be happy to assist you.