A macro that shows updates - OVER MY HEAD

[Sapphire69]

Hello,

I am trying very unsuccessfully to modify a macro that I found in another
post to work with my worksheet. My worksheet uses columns A-M. The way they
are set up, A is the date column. Columns B&C are "booked" and "estimated"
for Q1 respectively. Columns D&E are "booked" and "estimated" for Q2, F&G
are "booked" and "estimated" for Q3, and H&I are "booked" and "estimated" for
Q4. Columns J&K are totals for the "booked" and "estimated". Column L is
the combined total and Column M is for comments.

Ideally, what I would like is a macro that inserts a line at the bottom of
the spreadsheet and lists the updates as follows:
Column A would show the date of the change
Columns B-I would show any NEW values
Columns J-L would show totals
Column M would show the username of the person who updated the sheet
There would be a separate line for all changes made since the last time the
macro was run.

Here is the macro that I tried unsuccessfully to modify:

Private Sub Worksheet_Change(ByVal Target As Range)
'Column to be watched
Const sWatch As String = "J"
'Column of reference data that will show on Track sheet
Const sRef As String = "A"

Dim rWatch As Range
Dim rCell As Range
Dim sUser As String
Dim lOffset As Long

Set rWatch = Intersect(Target, Columns(sWatch))
If rWatch Is Nothing Then Exit Sub
sUser = Environ("username")
lOffset = Columns(sRef).Column - Columns(sWatch).Column
With Worksheets("DUEDATE-CONT COMPLIANCE")
ActiveSheet.Unprotect
For Each rCell In rWatch
With .Cells(Rows.Count, "A").End(xlUp).Offset(1, 0)
.Value = rCell.Offset(0, lOffset)
.Offset(0, 1).Value = Now
.Offset(0, 2).Value = sUser
.Offset(0, 3).Value = rCell.Value
ActiveSheet.Protect DrawingObjects:=True, Contents:=True,
Scenarios:=True _
, AllowFormattingColumns:=True, AllowFormattingRows:=True, _
AllowInsertingRows:=True, AllowDeletingColumns:=True,
AllowDeletingRows:= _
True, AllowSorting:=True, AllowFiltering:=True
End With
Next rCell
End With
End Sub