public function addUser($u, $p, $f, $l)
 {
     $query = "INSERT INTO `usernames`(`username`, `password`, `firstName`, `lastName`) VALUES ('" . $u . "','" . $p . "','" . $f . "','" . $l . "')";
     $dbAccess = new DBAccess();
     $dbAccess->insert($query);
 }