How do I change the email address to where the forms are submitted to once the customer fills them out and submits them?

If I understood you correctly you want to change Email address on which you are getting submissions when user submits your form.

You can do that inside of Email Notification by changing Recipient Email address.

Inside of this guide you can also find how to properly change and test a new email recipient address:

https://www.jotform.com/help/314-How-to-Properly-Change-and-Test-a-New-Email-Recipient-Address 

In case that you want to send Email to Multiple Recipients please read this guide.

http://www.jotform.com/help/39-Send-Notifications-to-Multiple-Recipients  

Hope this will help. let us know if you need further assistance.