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.
JotForm Support Manager
It looks like the form fields do not match with your Contact list fields at Mailchimp
To integrate with Mailchimp you are required to have the same field types as in any of your Mailchimp Contact Lists in order to match them with the form fields
So create the list at Mailchimp and then create a form and add the fields you wish to match accordingly. Once you have this done, you can make the integration
For further questions regarding to this issue, let us know