in imgboard.php look for
if ($cap_n) // Normal tripcode parsing
and change the following section to
if ($cap_n) // Normal tripcode parsing {
// If $cap_n is a staff password, use staff label if ($cap_n == ADMIN_PASS) {
$stafftrip = true;
$meta['userlevel'] = 4;
}
else if ($cap_n == MOD_PASS) {
$stafftrip = true;
$meta['userlevel'] = 3;
}