and some other general tips:

You can write your beginning lines like this:

print "\n"x7, '-'x80, "\n";
print "Welcome to Jamie's User Management System. \n\n"
  . "Please select the option that you wish to use:\n"
  . " -a -- To create a new username and password.\n"
  . " -u -- To update a users password.\n"
  . " -d -- To delete a user from the system.\n"
  . " -h -- For more help!\n\n"
  . " -q -- To quit this system\n\n";
[download]

The usage of the program 'perltidy' (from inside vim with :%!perltidy) can improve the readability of your scripts. I'm using it a lot.