Not to be flippant - but perhaps "the same way you would for one that you did
create"?

Use View | Headers/Footers and simply delete the existin header?

If the sheet or workbook is protected, there are several tools available to
unlock them - you can start he
http://www.mcgimpsey.com/excel/removepwords.html

"Maui Admin" wrote:

How to delete a header on an Excel spreadsheet that I did not create?