How can I edit this to work on more than just one Cell?

[tonywatsonhelp]

Hi Everyone,
The code below is a stop for a protected sheet so the tabing doesn't go everywhere,
however it only works on column G,
how can I change it so it works on G:M?
thanks
Tony

Private Sub Worksheet_SelectionChange(ByVal Target As Range)
LastR = Sheets("Weekly Data Input").Cells(Rows.Count, "F").End(xlUp).Row
    With Application
        If Target.Address = Range("G" & LastR).Address Then
            .OnKey "{TAB}", Me.CodeName & ".GoBack"
            .OnKey "{ENTER}", Me.CodeName & ".GoBack"
            .OnKey "{Down}", Me.CodeName & ".GoBack"
            .OnKey "~", Me.CodeName & ".GoBack"
        Else
            .OnKey "{TAB}"
            .OnKey "{ENTER}"
            .OnKey "{Down}"
            .OnKey "~"
        End If
    End With

   
End Sub
Private Sub GoBack()
LastR = Sheets("Weekly Data Input").Cells(Rows.Count, "F").End(xlUp).Row
Range("G" & LastR).Select
End Sub