how can i display a signature in the confirmation email?

Hi,

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.

Thanks.