After your first put-in of your personal details when filling in your white paper (registration), this will only change when uploading KYC documents on your account.
Whenever you want to change something (Username,Name, Surname) , you can create a ticket or send email to firstname.lastname@example.org and we will change it for You. You cannot do this yourself.
For Email, Password and PIN you can do this yourself in your Back-office.
If you have any difficulties, feel free to create a ticket.