An originating post can only be deleted by a moderator.
Hi Fred, If by an "originating post" you mean one's own post, then I disagree as any poster can delete their own post at any time. I have done it myself in the past whenever I've realised immediately that whatever I've written may no longer be relevant.
Just look along the top line of your post and you should see buttons to 'Quote', 'Modify' or 'Remove'. Hit the 'Remove' button if you want to delete the whole post (see attached image).
Kind regards,
Will
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