How to add proxies..

Is there anyone pls help me out I want to add proxies to this script…
The website has blocked all free hosts that uses this script
pls help me out…

$counter = 0;
$start = 1;
$agent = “Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7”;

$ch = curl_init();

  curl_setopt($ch, CURLOPT_URL,"http://");    
        curl_setopt($ch, CURLOPT_USERAGENT, $agent);
 curl_setopt ($ch, CURLOPT_HTTPHEADER, Array("Content-Type: application/x-www-form-urlencoded","Accept: */*"));
        curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_REFERER, "");
        curl_setopt( $ch, CURLOPT_AUTOREFERER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS,"LoginMobile=$username&LoginPassword=$password");
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