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.
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I'm having challenges understanding exactly your request, I guess you are asking about making a login form, in that case I have to say that it is not possible to create login forms.
Login forms are usually created to cheat users asking them for username and password of user accounts, so our phishing form detector will block your account if it detects any form containing username and password fields.
In addition to what guilledutra has said, we do not allow these type of forms as this is considered Phishing and it violates our terms use