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 build as many forms as you need even with the free plan, the "three" number at the premium plan details refers to the quantity of sub-user accounts that you can attach to your main account.
Sub-users are usefull when you need share your forms and submissions and give that sub-users for example te ability of edit your shared forms or watch/edit the submited data, in other words you can work in a collaborative way with three more users and you will be controlling the shared forms.
For more info about the sub-accounts check this doc http://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User