Continuing the discussion from Howto backup ssh-keygen -t ed25519 created type of keyfile and use SSH?:
@ion, I found out how to generate a “Reply as a Linked Topic”. You can click the date in the right column of a message header, c.f. yellow maker.
And then the following dialog shows up - where you can click on “+ New Topic”.
Maybe we could update the community guidelines with an explanation as it is really not so obvious how the reply as a linked topic.