You can't currently change your billing email address from within the application. This address can be different from the one you use to sign into the application.
If you need to change the billing email, the billing company name, or the billing address, please let us know exactly what you want it changed to and we'll make the changes for you.
Changes to these fields will only apply to future invoices. For example, changing your company name or address will not change this information on old statements.