As far as I can see I can edit any note that was created, either public or private, but cannot edit a reply. That makes sense as a reply generates an email to the customer so editing it would create two versions of what was sent. As far a I can see this applies both to replies I sent, and replies other agents sent.
It is possible to edit a customer response, and we do use this, especially when a customer mail was sent to us outside FreshDesk and the mail was forwarded. We then change the sender and delete any details about the forwarding.
I can delete replies. I have had the problem that a reply was sent twice (at the same time, I think a problem with my mouse driver). Then I have deleted the second reply which is identical. However, the customer has probably received two emails.
So the me the available options make sense.
OK, that all makes sense.
Thanks Mark