You can update your email address through your account Settings.
To do this, head to the dropdown arrow next to your Studio's name, and click Settings > My Account.
Here you'll see an Email address field. Enter your new email address here, and click Save changes at the bottom of your page to confirm.
Please note: Once you've saved, you'll receive a confirmation email that contains a link to confirm the change.
You'll need to ensure you click this link to confirm, or the change won't be saved.