Only account Admins can change the notification settings.
If you are an admin:
1. Click on your name dropdown and select "Account & Settings"
2. Click on the Notifications tab.
Slide the button to the right to receive purchase and invoice notifications.
Slide the button to the left to turn notifications off.
Please note that at least one user must be set up to receive these notifications. If you are unable to turn off the notification, you will need to ensure another user has this notification turned on first.
You cannot change your email address. You can find you email address here: