Welcome to HBH! If you had an account on hellboundhacker.org you will need to reset your password using the Lost Password system before you will be able to login.
Learning server hacks
dude, look at www.rootthisbox.org it has a bunch of wargames set up. you literally try to root the box ;)
also, www.hackerslab.org have a telnet server set up that they use for thier challenges.
course on the darker side, you could always use google to find some insecure sites ;)