Nevermind, I figured it out:
In 'onlineuser.php', find:
PHP Code:
$totalonline = $numberregistered + $numberguest;
Replace with:
PHP Code:
$totalonline = $numberregistered + $numberguest - $bbuserinfo['invisible'];
Still in 'onlineuser.php', find:
PHP Code:
$numberregistered = number_format($numberregistered);
Replace with:
PHP Code:
$numberregistered = number_format($numberregistered) - $bbuserinfo['invisible'];