PIN can be changed on our site. Login to your account with your current login and PIN:
Open the menu in the top right corner of the page and select "Edit account":
Change your current PIN in the window that will appear:
Click "Save" button when done.
Login and email can be changed from our end only. Please contact us at firstname.lastname@example.org with the current and the desired login and/or email, and we'll change them for you.