Sorry, very new to formulas and code. The code below will populate a cell
with the update date/time when the cell next to it is updated. Works
GREAT...on that one cell! How do I apply this code to an entire column? I'm
sure I need to enter a range of cells somehow into this code but I don't know
how to do this.

Option Explicit
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Address = "$D$7" Then
Target.Offset(0, 1) = Format$(Now, "dd/mm/yy hh:mm")
End If
End Sub