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You need first to add an Autoresponder E-mail to your form.
user guide: -Creating-a-Form-Autoresponder
then make sure the E-sign widget is in the email message template
You can test my demo form http://form.jotformpro.com/form/51397211156957?
provide your own email account to be able to receive the Autoresponder email, and you will see the e-signature on the email message.
Hope this help. Let us know if you need further assistance.