VBA Merge Cells Help

[cmschmitz24]

Hello,

I would like the code below to then be merged between cells A:D.

Cells(lastrow, 1).Offset(8, 0).Select
    With Selection
        .Value = "Account Holder Signature"
        .HorizontalAlignment = xlCenter
    End With
    With Selection.Borders(xlEdgeTop)
        .LineStyle = xlContinuous
        .ColorIndex = 0
        .TintAndShade = 0
        .Weight = xlThin
    End With

I would also like to have the cells directly above be merged as well, A:D.

Thanks!