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.
Though creating authentication form in JotForm is not possible but there is a possible workaround where you can take advantage of our conditional logic feature to achieve your requirement.
This thread should help you where one of our colleague has provided a step by step guide: http://www.jotform.com/answers/21374-How-can-I-password-protect-a-form
Please be noted that we have an anti-phishing system in place which does not like "Password" text or a combination of fields like "Email / Password" or "Username / Password". To avoid automatic suspension of your account, we advise you to rename your "Password" field to "Pin / Code / Key etc"