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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If I understood your question correctly, you are asking if you upgrade you account, will you be able to create login form with password field.
Phishing - You agree that Company may terminate your JotForm Service immediately if a form is created or JotForm is found to be used to: Obtain credit cards sensitive information, get social security numbers, show content with child pornography. Or if a form was made to steal user login credentials. All these activities are considered as Phishing and any account along with the guilty forms will be suspended immediately.
If you create form with those fields you account will be disabled.
If I did not understood you correctly please explain in more details what you are trying to achieve and we will be happy to assist you.
Hope this will help. Let us know if you need further assistance.