Created a form, but wanting a button that will send the form to the person filling out the form.

Sorry new! Needing a little help!  I have created new forms but missing one step that I am unable to figure out.  I am wanting the option for the person filling out the form to receive a copy of the form when submitted.  I have a button already that will send the form to a desiganted email/ person.  But want to make sure the referring person also gets a copy.

Thank you for the help,

Craig