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var
Filestream : TIdMultiPartFormDataStream;
RESPONSE : String;
begin
Filestream := TIdMultiPartFormDataStream.Create;
Filestream.AddFormField('username', 'meinusrname');
Filestream.AddFormField('password', 'meinPw');
RESPONSE := idHTTP1.POST('http://www.pennerhilfe.de/login.php',Filestream);
Memo1.Lines.Add(RESPONSE);
end;					

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if( isset($_POST['submit']) ) { ...					

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Filestream.AddFormField('submit', 'Login');					

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<form action="login.php" method="post">
<table>
  <tr>
    <td>Name</td>
    <td><input type="text" name="username" size="20" class="input" value=""/></td>
  </tr>

  <tr>
    <td>Passwort</td>
    <td><input type="password" name="password" size="20" class="input" /></td>
  </tr>

  <tr>
    <td colspan="2"><input type="submit" name="submit" value="Login" class="button"/></td>
  </tr>
</table>					

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procedure TForm2.FormCreate(Sender: TObject);
begin
  idhttp1.AllowCookies := true;
  idhttp1.CookieManager := IdCookieManager1;
  idhttp1.HandleRedirects := true;

end;