Dim i As Byte, j As Byte, nbl&, lig As Long
nbl = Range("A" & Rows.Count).End(xlUp).Row
With Me.ListBox1
For i = 0 To .ListCount - 1
If .Selected(i) = True Then
lig = Range("A2:F" & nbl).Cells.Find(what:=.List(i), lookat:=xlWhole).Row
Range("F" & lig) = "X"
End If
Next i
End With