A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
If you merely want to display a message:
Sub ClearCellsMon()
MsgBox "Click OK to clear a bunch of cells in the Creator sheet.", vbInformation
Application.ScreenUpdating = False ' makes things much faster, no flickering
With ThisWorkbook.Worksheets("Creator")
...
If you want to give the user a chance to cancel:
Sub ClearCellsMon()
If MsgBox("Click OK to clear a bunch of cells in the Creator sheet", _
vbOKCancel + vbQuestion) = vbCancel Then Exit Sub
Application.ScreenUpdating = False ' makes things much faster, no flickering
With ThisWorkbook.Worksheets("Creator")
...