Create new thread via script vbulletin - php

Question

I have a script to create new thread with via scritp in vbulletin
// Create a new datamanager for posting
$threaddm =& datamanager_init('Thread_FirstPost', $vbulletin, ERRTYPE_ARRAY, 'threadpost');
// Set some variable and information
$forumid = 87; // The id of the forum we are posting to
$userid = 2;
$_POST["title"] = $vinanghinguyen_title;
$_POST["content"] = $final_content; // The user id of the person posting
$title = $_POST["title"]; // The title of the thread
$pagetext = $_POST["content"]; // The content of the thread
$allowsmilie = '1'; // Are we allowing smilies in our post
$visible = '1'; // If the post visible (ie, moderated or not)
// Parse, retrieve and process the information we need to post
$foruminfo = fetch_foruminfo($forumid);
$threadinfo = array();
$user = htmlspecialchars_uni( fetch_userinfo($userid) );
$threaddm->set_info('forum', $foruminfo);
$threaddm->set_info('thread', $threadinfo);
$threaddm->setr('forumid', $forumid);
$threaddm->setr('userid', $userid);
$threaddm->setr('pagetext', $pagetext);
$threaddm->setr('title', $title);
$threaddm->set('allowsmilie', $allowsmilie);
$threaddm->set('visible', $visible);
// Lets see what happens if we save the page
$threaddm->pre_save();
if(count($threaddm->errors) < 1) {
// Basically if the page will save without errors then let do it for real this time
$threadid = $threaddm->save();
unset($threaddm);
} else {
// There was errors in the practice run, so lets display them
var_dump ($threaddm->errors);
}
/*======================================================================*\
It can create new thread with title, forumid, userid.....but it not insert tag. I want insert with this script. thank for help