Sub Bouton1_Clic()
Dim xrg As Range, marque
marque = Sheets("Feuil1").Range("n2")
With Sheets("Feuil2").Columns("a:a")
Set xrg = .Find(What:=marque, After:=.Cells(Rows.Count), LookIn:=xlValues, lookat:=xlWhole, MatchCase:=False)
End With
If xrg Is Nothing Then
MsgBox marque & " : non trouvée.", vbCritical
Else
xrg.Offset(, 1) = Val(xrg.Offset(, 1)) + 1
MsgBox marque & " : la valeur est passée à " & xrg.Offset(, 1), vbInformation
End If
End Sub