how do i create an automatic response?

In order to create an automatic response(so the user receives a confirmation email) please check this guide: http://www.jotform.com/help/26-Creating-a-Form-Autoresponder

Also, If you wish to create an email notification(so you get an email each time a submission is made) here is how: http://www.jotform.com/help/25-Setting-Up-Email-Notifications

If you need anything else please open a new thread, we will be glad to assist you.