How can I program the form to submit to a fixed email but also CC the user who requested the form?

How can I create a custom submit button which will allow me to enter the users email before pressing send so that it sends it both to the permanent email embedded in the button and the user email depending who is using it?

You just need to setup an email notification: https://www.jotform.com/help/25-Setting-Up-Email-Notifications 

And an autoresponder: https://www.jotform.com/help/26-Setting-Up-an-Autoresponder-Email 

Let us know if you need more help.