To change the email address in the account, we first need to make sure that the person who wants to change it is, in fact, the account's legal representative.
We will, therefore, ask you to send an email to firstname.lastname@example.org. In this email you add a request (in writing or typed) in which you indicate that you want to change the email address in your account and include the new email address. Please sign the request and send a scan of it together with a copy of the legal representative's ID to us.
Read also: How do I set a new password?