Código :
Ver originalPrivate Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, _
ByVal bScan As Byte, _
ByVal dwFlags As Long, _
ByVal dwExtraInfo As Long)
Private Sub Buscar(Optional TextoABuscar As String)
WebBrowser1.SetFocus
Call keybd_event(vbKeyControl, 0, 1, 0)
Call keybd_event(vbKeyF, 0, 1, 0)
Call keybd_event(vbKeyF, 0, 3, 0)
Call keybd_event(vbKeyControl, 0, 3, 0)
DoEvents
If TextoABuscar <> "" Then
SendKeys TextoABuscar
SendKeys "~"
End If
End Sub
Igual esto te sirve