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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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press the email envelope icon at the top bar,
you will get a drop down containing "notification"
ignore that and press "Add New Email"
This will give you the option to add an "Autoresponder" email, the defaults will work, but you can configure all sorts of options here
As @paulmanton said you need to add Auroresponder Email. For more information, please take a look at this article:
If you need further assistance, please let us know.