When You register your mailbox, Your entered personal data is automatically taken for creating Your account. If You 've entered incorrect information or it has been changed, You can fix it.
If You want to change Your basic personal data, You can do it in the "User profile" (more).
If You want to change only that data , which is seen to the recipients of Your letters, You can do it in "Options" - more information here.
In case you did not find your answer contact us