I'm not sure what you want, but if you just want to change password, then go here - NEXON Europe Passport Login (link to Nexon EU login screen) and login, then press My Account button at top right and you will be able to edit your settings (it will probably ask you to enter birthdate, e-mail etc., no idea why because you already do it when registering, but you just fill it like you registered and then you can change password).