Thanks for reaching out to us. Your details are shared across all of your Qlik portals and managed via a Single Sign On profile. You can submit a request to Qoncierge to have your email address changed by either following the prompts on the Qoncierge support page, or by sending an email to firstname.lastname@example.org.
Be sure to let them know your current email address and the new address you'd like to use. Also let them know that you'll need your community profile to reflect this change.
Let me know if there's anything else I can do for you.