How Do I Delete a File From the TimeMachine Backups?

My wife and I have watched the Macmost Youtube video, “How To Remove All Copies Of a File From Time Machine (#1690). We cannot find the Action command to delete all Timemachine file backups. The “Gear” does not show up. There is an “Action” menu, but no choices for deleting files. Command-Right Clicking the mouse also does not reveal the delete option.
Is it no longer possible to delete a file or document in Timemachine?
I want to delete some PDF files of financial information. I can delete them from “Documents or the “Desktop” using Finder. However, I want to remove all copies of the file(s) that have been backed up by Timemachine.
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Steve