Profile field stats in welcome post

[Mr Chad]

im useing a welcome post hack which posts a thread when the member registers, i was looking at the code:

// Backend Files
require_once('./global.php');
require_once('./includes/class_dm.php');
require_once('./includes/class_dm_threadpost.php');

// Setup Variables
$forumid = 7; // The forum id that you want the thread posted in
$postuserid = "" . $postuserid; // The Userid of the poster
$postusername = "" . $postusername; // The username of the poster
$title = "Welcome: " . $username . " to ChatBum"; // The thread title

// Don't change below this line

// Start thread create
$threaddm = new vB_DataManager_Thread_FirstPost($vbulletin, ERRTYPE_STANDARD);

$username = htmlspecialchars_uni($username);
$allowsmilie = '1';
$visible = '1';
eval('$pagetext .= "' . fetch_template('welcome_thread') . '";');

// Insert thread
$threaddm->do_set('forumid', $forumid);
$threaddm->do_set('postuserid', $postuserid);
$threaddm->do_set('userid', $userid);
$threaddm->do_set('username', $postusername);
$threaddm->do_set('pagetext', $pagetext);
$threaddm->do_set('title', $title);
$threaddm->do_set('allowsmilie', $allowsmilie);
$threaddm->do_set('visible', $visible);
$tid = $threaddm->save();

// Update last post stuff on forumdisplay
require_once('./includes/functions_databuild.php');
build_forum_counters($forumid);

And the temple the message in uses the $username. So how would i make the post grab the users current profile field status like:

<if condition="$post[field1] != ''"><div>$post[field1]</div></if>
<if condition="$post[field2] != ''"><div>$post[field2]</div></if>
<if condition="$post[field3] != ''"><div>$post[field3]</div></if>
<if condition="$post[field4] != ''"><div>$post[field4]</div></if>
<if condition="$post[field5] != ''"><div>$post[field5]</div></if>
<if condition="$post[field6] != ''"><div>$post[field6]</div></if>
<if condition="$post[field7] != ''"><div>$post[field7]</div></if>
<if condition="$post[field8] != ''"><div>$post[field8]</div></if>
<if condition="$post[field9] != ''"><div>$post[field9]</div></if>
<if condition="$post[field10] != ''"><div>$post[field10]</div></if>
<if condition="$post[field11] != ''"><div>$post[field11]</div></if>
<if condition="$post[field12] != ''"><div>$post[field12]</div></if>

I really need help.