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.
You can learn more about sub account users here: http://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User.
Basically, the sub account users are just the same with other JotForm accounts, it is set as a sub account because there are forms shared to it as a sub user. Sub accounts can create their own forms, get their own subscription plan and share their own forms to other account users.
I hope that helps. Do let us know if you need further assistance on this.