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Which email address you want to change?
#1. If you want to change your profile email address of your account, you will have to change it form your account setting page. Please check the screenshot below:
#2. If you want to change the email address on which you receive submission emails, you will have to change the "Recipient Email" of your notification email alert. The following guide should help you: http://www.jotform.com/help/41-Finding-out-E-mail-Address-used-for-submission-notifications
Hope this helps.
Do get back to us if you have any questions.