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 suggest reviewing this user guide also
Form sub-users are those users that are allowed to use the shared main account's forms to other users(sub-accounts). You can use this feature if you want to maintain control of a form and allow sub-accounts to work on it also.
Hope this help. Inform us if you need further assistance.