Как зарегится на сайте с помощью IdHttp->Post()?

IdHTTP1->Request->Host = "http://www.marinetraffic.com/";
IdHTTP1->Request->Accept = "application/json, text/javascript, */*; q=0.01";
IdHTTP1->Request->Connection = "keep-alive";
IdHTTP1->Request->UserAgent = "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
IdHTTP1->Request->ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
IdHTTP1->Request->AcceptLanguage= "ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3";
IdHTTP1->Request->Referer = "http://www.marinetraffic.com/en/p/plans";
 
try
{
 RichEdit1->Lines->Add("email=mamaev.ivan2013@gmail.com");
 RichEdit1->Lines->Add("password=poiuytrewq");
 RichEdit1->Lines->Add("is_ajax=1");
 RichEdit1->Lines->Add("remember=1");
 
 String posturl = "/en/users/ajax_login?_=1830862388";
 String url11 = "http://www.marinetraffic.com/";
 IdHTTP1->Get(url11);
 Memo2->Text= IdHTTP1->Response->ResponseText;
 
 IdHTTP1->Post(posturl,RichEdit1->Lines);
 RichEdit1->Lines->Add(IdHTTP1->Response->ResponseText);
 RichEdit1->Lines->Add( IdHTTP1->Response->RawHeaders->GetText() );
 
}catch (...) {
 
}