you can change your password via the
user control pannel (top right corner of the forums) however you cannot change your username unless you become a mod or admin and your username isn't professional looking or whatever.
and I'm not sure why you're so worried about hackers I'm pretty sure no hacker has ever been successful in this game unless the player actualy hands them the account info (which isn't really hacking) apart from one time in like 2012-2013 when a hacker managed to get hold of the admin controls and caused havoc on a battledawn server