'How to add an SSH Key to CircleCI

I'm trying to add an ssh key(private key) to CircleCI, but I have a question.

Which private key do I have to add, private key generated on local PC or generated on server what I want to access with ssh?

Document says that In a terminal, generate the key with ssh-keygen -t ed25519 -C "[email protected]".

ssh circleci

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