Step 1:
Navigate to your settings page and click on the "CHANGE EMAIL" button.
Step 2:
Enter the new email address you want to begin using. You will need to validate that your are the owner of that email address by entering the passcode sent to the email.
Step 3:
Log out and back in using the same method that was previously used to access your account (e.g. Google SSO or email/username and password)
