Sprinx, а что в инструкции делает кусок кода из моды постеров: 
[CODE]Открыть posting.php
Найти
if (defined('TORRENT_ATTACH_ID') && $bb_cfg['bt_newtopic_auto_reg'] && !$error_msg)
Ниже добавить
if ($mode == 'newtopic' && defined('TORRENT_ATTACH_ID') || defined('TORRENT_ATTACH_ID') && $bb_cfg['bt_newtopic_auto_reg'] && !$error_msg)
{
$row = DB()->fetch_row("SELECT post_text FROM ". BB_POSTS_TEXT ." WHERE post_id = $post_id");
preg_match_all('/\[poster\](.*?)\[\/poster\]/i', $row['post_text'], $poster4, PREG_SET_ORDER);
preg_match_all('/\[img=right\](.*?)\[\/img\]/i', $row['post_text'], $poster3, PREG_SET_ORDER);
preg_match_all('/\[img=left\](.*?)\[\/img\]/i', $row['post_text'], $poster2, PREG_SET_ORDER);
preg_match_all('/\[img\](.*?)\[\/img\]/i', $row['post_text'], $poster1, PREG_SET_ORDER);
$url = '';
if (isset($poster3[0][1])) $url = $poster3[0][1];
elseif (isset($poster4[0][1])) $url = $poster4[0][1];
elseif (isset($poster2[0][1])) $url = $poster2[0][1];
elseif (isset($poster1[0][1])) $url = $poster1[0][1];
DB()->query("UPDATE ". BB_TOPICS ." SET topic_image = '$url' WHERE topic_id = $topic_id ");
}[/CODE]