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 us more details about this? Was the form embedded on website? Can you share to us the URL of your website where we can test/check the form?
I check your form http://www.jotform.com/21235092099958 and I can see the submit button below.
You may also want to review this guide -How-To-Add-Options-In-The-Payment-Form, it should help.