How to change email adress
To change the email address for your account, click on the avatar in the top right corner and then on Profile. You will be taken to the Profile page.
Here you can change the email address, as well as your account name and notification email address.
To change your billing address, go to settings by clicking on the cogwheel in the upper right corner.
Go to the Payment tab. Here you can change your billing address, as well as subscription plan and payment method.