[ALexandr555]

Так ну вот уже пример
страничка

Код:

var
  i: Integer;
  elem: IHTMLElement;
  document: IHTMLDocument2;
  all: IHTMLElementCollection;
begin
document:=WebBrowser1.Document as IHTMLDocument2;
 all:=document.all;
for i:=0 to all.length-1 do
  begin
   elem:=all.item(i, '') as IHTMLElement;

   if (elem.getAttribute('name',0)='first') then
   if (elem.className='form-input') then
   elem.innerText:=name;
  end;
end;

а строчка которую я ищю

<input type="text" name="first" value="" class="form-input" id="r_first-name"/>