php based vbulletin leech script

I have a php based leech script consisting of 3 files to leech from one forum to post on another.
The code is similar to what I have posted below. Can someone please help me configure it to work?
All I want to know where to enter or change username to leech from abc.com and post to another board xyz.com
<?php
function xtremelogin($username,$password){
$post_fields =array(
'vb_login_username' => $username,
'vb_login_password' => $password,
'do' => "login",
's' => '',
);
$url = "http://abc.com/login.php";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, 4);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_COOKIEJAR,"cookie1.txt");
$result= curl_exec ($ch);
curl_close ($ch);
}
function xtremepost($subject,$message,$forumid){
$ch3 = curl_init();
curl_setopt($ch3,CURLOPT_URL,"http://xyz.com/newthread.php?do=newthread&f=" . $forumid);
curl_setopt($ch3,CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch3,CURLOPT_CONNECTTIMEOUT,"120");
curl_setopt ( $ch3, CURLOPT_HEADER, false );
curl_setopt($ch3,CURLOPT_COOKIEFILE,"cookie1.txt");
$souvik12345 = curl_exec($ch3);
$error=curl_error($ch3);
curl_close($ch3);
preg_match('%name="securitytoken" value="(.*)"\ /\>%',$souvik12345,$security123);
$post_fields123 =array(
'subject' => $subject,
'message' => nl2br($message),
'wysiwyg' => 1,
'iconid' => 0,
'securitytoken' => $security123[1],
'f' => $forumid,
'do' => 'postthread',
'posthash' => '8d8769e64433fd28ad72a4a86cb8d808',
'loggedinuser' => '1',
'sbutton' => 'Submit New Thread',
'parseurl' => '1',
);

$ch2 = curl_init();
curl_setopt($ch2,CURLOPT_URL,"http://xyz.com/newthread.php?do=newthread&f=" . $forumid);
curl_setopt($ch2,CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch2, CURLOPT_POST, 4);
curl_setopt($ch2, CURLOPT_POSTFIELDS, $post_fields123);
curl_setopt($ch2,CURLOPT_CONNECTTIMEOUT,"120");
curl_setopt ( $ch2, CURLOPT_HEADER, false );
curl_setopt($ch2,CURLOPT_COOKIEFILE,"cookie1.txt");
$souvik123 = curl_exec($ch2);
$error=curl_error($ch2);
curl_close($ch2);
}
?>

 

so I guess this is tuff nut to crack