If you want to change the associated email address you can contact out customer service by mail.
As a private customer, you can write to us here.
In order to change your e-mail adress, we need your acceptance. You therefore need to provide as much information in the description fiels as possible to identify yourself in relation to your account.
In the description field you must state:
It is important that you state which email address should be the new one.
You can change the email address of your own profile at any time by logging into My Account. You will find it under 'Profile information'.