Move your mouse cursor on the menu  'My Webcenter' and click on the submenu 'My Profile'. 

In 'My Profile' you can check and adjust your name, mail address, phone number and function. If there is a change in the e-mail address, please sent us ( a short notification also, as your e-mail address is also your login.

Do not forget to click on Save, if you want to change your user details.