If you need to change information on the email-user that you have on your account you should do so at User & Devices configuration on the Users chart
Login at SelBuk.com
Email / Password > Login
My Account > User & Devices configuration
Users box > Click on the letter E under the column Edit
My account on this screen you may change the data and then update keep in mind that there are some fields that are required. Once the update has been done, you should logout from the device and login again to accept it.