замени в forum/say.php
mysql_query("UPDATE `users` SET `balans`='" . ($datauser['balans'] + 1) . "' ,`postforum`='" . ($datauser['postforum'] + 1) . "', `lastpost` = '$realtime' WHERE `id` = '$user_id'"); замени в forum/say.php
mysql_query("UPDATE `users` SET `balans`='" . ($datauser['balans'] + 1) . "' ,`postforum`='" . ($datauser['postforum'] + 1) . "', `lastpost` = '$realtime' WHERE `id` = '$user_id'");