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.
To further assist you, may I know more details of the problem you are having? Are you getting an error message or something similar? A screenshot of what you are seeing would also help us a lot to identify the problem.
You can also see the initial setup on the "JotForm Email Newsletters" here in the screenshots provided in the details, http://apps.jotform.com/app/email_newsletters.
I would also like to suggest this guide that we have if you want to send newsletter emails to users, How to integrate MailChimp for Email Newsletters.
I hope this helps. Let us know if you need further assistance on this.