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I presume you would like to change the sender email? If you would like to use your own email as the sender email, you can follow any of the guides below:
I highly recommend using the SMTP details of your email.
If what you mean is how to change your recipient address for your form's email notifications/autoresponders, you can follow this guide: http://www.jotform.com/help/41-How-to-find-and-change-the-email-address-used-for-notification-email
Let us know if you need more assistance on this.