How do I receive confirmation email when someone submitted on my form?

You should create an email notification in order to receive an email when someone completed your form. Here are the guides that will help you set up your notification:

https://www.jotform.com/help/25-Setting-Up-Email-Notifications
https://www.jotform.com/help/39-Send-Notifications-to-Multiple-Recipients
https://www.jotform.com/help/30-Explanation-of-Email-Notification-and-Autoresponder-Settings

Hope that helps. Thank you.