To change the email address you use to log in, you can easily invite that address as a new team member.
Open "Team" by clicking on your organisation name in the top right corner of your screen and selecting "team in the menu on the left.
Invite a New Member by clicking “Invite Team Member” button on the right side of the screen.
Accept the Invitation on the newly added email address:
The invited email address will receive an email. Once accepted, it becomes part of your team with access to your events.