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var
  Form1: TForm1;
  i:integer;
  geladen:boolean=false;

implementation

{$R *.dfm}

procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject;
  const pDisp: IDispatch; var URL: OleVariant);
begin
geladen:=true;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
Webbrowser1.Navigate('http://beipsiel.abc/formular.php');
repeat
Application.ProcessMessages;
Sleep(100);
until geladen=true; Button1.Click;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
WebBrowser1.OleObject.document.forms.item(0).elements.item('yourmessage').value:='HIER!! Mein Text';
WebBrowser1.OleObject.document.forms.item(0).submit;  // Daten an Server senden
end;