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.
Is the MailChimp integration working now? It is not clear if there is issue with your form integration to MailChimp.
If the integration is actually working, you may want to try first re-submitting the submission.
You can do this using the EDIT button in the View Submission page of the form.
It should trigger the signup after the submission if the MailChimp integration is working.
Let us know if this did not resolve the issue.