What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Can you provide a screenshot to show us where exactly you receive the error? I see that you have some forms created in your account, but they don't have any fields in them.
You need to add fields to your form in order to be able to submit them.
Are you receiving the mentioned error when you drag & drop the fields to your form? I also suggest you to read the following guide: https://www.jotform.com/help/2-How-to-Create-Your-First-Web-Form