Your login email can be changed from the Settings page. Click on Settings in the left hand navigation bar.
Within Settings, click Security where you can change your login email as well as reset your password, and set up an app authentication. On the Security page, enter the new email address you'd like to use in the Change Email section then click the Save button.
Note: If you do not click the Save button and navigate away from the Settings page, then your email address will not be updated.
For security purposes, to confirm that you are the legitimate account owner requesting the login email change, a code will be sent to your old login email address. Once you enter the code, your login email address will be changed.