how can I receive an email each time a form is filled out?

You must create an email notification for you and anyone else (up to 10 recipients):

https://www.jotform.com/help/25-Setting-Up-Email-Notifications

You can also create an autoresponder, if you want to notify the user.

https://www.jotform.com/help/26-Creating-a-Form-Autoresponder