You can change your personal data in the Client Area in the Account Settings > Personal Information section.
In this section you can change the address and date of birth. Please note that the "Name" and "Phone number" fields cannot be edited in the Client Area. To make changes to these fields, you must contact the customer support department at email@example.com. The email should include the account number and the code word, as well as an attached scan/photo of your identity document.