If you actually mean the text in the header of the page or report, then use
fred's recommendation.
If you mean the caption at the top of the report, you can add some code to
the reports Open event.
Private Sub Report_Open(Cancel as integer)
me.Caption = inputbox("Enter report caption")
End Sub
Or, you could do this in the Immediate window of the VB Editor:
Reports(0).Caption = "Report Caption"
I have a custom Report menu that I use will all of my reports, and if I
select one of the Export options, the function that handles that askes what
the Report Caption should be, because that is what the name of the file will
be.