Excel VBA find/replace loop - really new at VBA - loops

Question

I need to add a section within an existing macro that takes a cell's address and looks for that address (as a string?) from the values within a range of cells elsewhere on the sheet - then offsets one column over to use that cell's value to replace the original value of the cell who's address was searched.
My code is looking for unmerged cells, and when it finds an unmerged cell, it needs to grab the correct value to put in there. Not all cells in my range mCell are unmerged, so this is a find/replace within a loop.
I cannot hard code the cells, and also cannot figure out a functional loop that successfully moves through my range and finds/replaces using values from another part of the worksheet. I'm new at VBA and keep getting errors and wind up defining a dozen ranges and strings trying to carry over the data. Any help would be greatly appreciated!
For example:
if unmerged mCell.address = "B20", then the macro finds the value "B20" in a designated range (in example below, was found in cell Q20), then offset one column over (to cell R20), then uses value of that cell (which is 6) to replace the value of mcell, such that the new cell value of B20 (i.e., the active mCell) = 6. Then on to the next unmerged mCell...
row Column Q Col. R '(not code, but can't get formatting any other way)
18 B18(text) 5
19 B19 4
20 B20 6
21 B21 3
Thank you for any suggestions, My existing code works great until "Part II", but then I'm failing miserably and am requesting specific help on how to correct/improve the code. Existing code is:
' This sub looks for the word "Table" in column A. If the word appears, it unmerges the cells in columns B - E
' and the rows following to allow for the insert of a table, then merges all other rows for sake of format.
Option Explicit
Private Sub Worksheet_Activate()
Application.ScreenUpdating = False
Range("B14:E64").SpecialCells(xlCellTypeVisible).Select
With Selection
.RowHeight = 17
.VerticalAlignment = xlTop
.HorizontalAlignment = xlLeft
.WrapText = True
End With
'*******Merge or unmerge rows according to whether or not they contain Table data -
' this only acts on visible cells, so rows of data table can be hidden as needed
Dim TA As Integer
Dim ColValues As Variant
Dim rng As Range
Dim tabNo As Range 'uses value on worksheet to know how many rows to unmerge
'*******Dims in finding and replacing unmerged cell values
Dim mergeRange As Range 'Range B16:E64 - where my mCells are being pulled from
Dim mCell As Range 'Cell that is unmerged, looking for its address
Dim ws As Worksheet
Dim tabledata As Range 'Range Q11:Q38 - this is the column I'm searching in and offsetting from
Dim aCell As String 'picks up cell address, to use in .find
Dim myCell As Range 'cell address in Q
Dim ReplaceString As String
Dim foundCell As Range
Dim bCell As Range
Dim i As Long
Application.DisplayAlerts = False
'Make column B = Column A values, cannot make this happen on sheet, because data is too variable
ColValues = ActiveSheet.Range("A16:A64").Value
ActiveSheet.Range("B16:B64").Value = ColValues
'Look for data table, if not present, merge cells
Set rng = ActiveSheet.Range("B14:B100")
Set tabNo = ActiveSheet.Range("K6")
For TA = 15 To 64 'defines TA variable to loop from row 14 to row 64
If Cells(TA, "A") = "Table" Then '
Range("B" & TA & ":E" & TA + tabNo).UnMerge 'unmerges the row with "Table" listed and the next 7 rows (to make a 8-row x 4 column unmerged area for table
TA = TA + tabNo ' moves active cell "TA" down 7 spaces
Else
Range("B" & TA & ":E" & TA).Merge 'If "Table" not found, then merge the cells for the row TA is in across columns B:E
End If
Next TA
'*** Part II: Need some calculation to loop or offset or find through data and fill
'unmerged cells from a data table on the worksheet.
'the placement of the data table varies depending on the layout of the report,
'which changes day to day, so can not be hard coded into the cells - needs to look up
'position of the word "Table" and dump data after that.
'offset? .find? loop?
'***want to take the cell address of each unmerged cell within the range of the report
'and look for that cell in an array, then replace the cell contents with the correct value
Set mergeRange = ActiveSheet.Range("B16:E64")
For Each mCell In mergeRange
' If mergeRange.MergeCells = True Then
' MsgBox "all cells are merged, exiting sub"
' Exit Sub
'Else
If mCell.MergeCells = False Then
aCell = mCell.Address '??? Need to set the cell address as
'a text string or something in order to look for that address in the values
'of cells in range "tabledata"
'MsgBox "aCell " & Range(aCell).Address
Set tabledata = ActiveSheet.Range("Q11:Q38")
Set bCell = tabledata.Find(aCell, After:=Range("Q1"), LookIn:=xlValues, lookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:=False, SearchFormat:=False)
'this gives me a "type mismatch" error that I cannot clear
'- then wanting the value of the cell offset one column over
'need to take the value of that offset cell and use it
'to replace the value of the original unmerged cell (mCell)
ActiveCell.Offset(1, 0).Select
ActiveCell.Offset(0, 1).Value = ActiveCell.Value
Application.DisplayAlerts = True
Application.ScreenUpdating = True
End If
Next mCell
End Sub

Answer 1

There were a few problems in there but I think it's working now. You'll have to verify as I'm still not 100% sure what it is supposed to do.
Problem 1: You don't need tabledata. You specify in the search parameters After:=Range("Q1") so it's looking in the right place. Find works on a Cells so your line should be:
Set bCell = Cells.Find(aCell, After:=Range("Q1"), LookIn:=xlValues, lookAt:=xlWhole, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:=False, SearchFormat:=False)
Problem 2: Your line aCell = mCell.Address needs to be aCell = Replace(mCell.Address, "$", "") as it comes in as an absolute cell reference and the cell address on your sheet are not (probably a more elegant way of doing this).
There were a couple of other problems in your Dropbox file but those should be sorted too now. There was an extra Next and the line aCell.Offset(, 1) = bCell.Offset(, 1) seems like it should be mCell.Offset(, 1) = bCell.Offset(, 1).
https://www.dropbox.com/s/jqdg3v0gd59mxjn/Test%20Workbook%201016jb.xlsm