You can edit your email address by navigating to the EMS App Dashboard (where you can find FAQs and Energy Saving tip) and pressing the Profile button at the bottom right of the page:
Once selected, you will then be taken to a new page that has a list of Account options.
Please choose the option:
You can then edit your account information including your Email address.
If you have signed in using a Social login (Apple ID, Gmail); this option will be greyed out and you will have to request a change of email through your Apple or Gmail account.