They must have the keys to unencrypt them and send them to the HN server.

> Set and forget - queue up multiple submissions ahead of time.

If it's your own post, it's better to be around an reply some of the comments. People is more friendly when the author is here.

If it's not your own post, it's also good to be around. Perhaps you can reply with another post of the same author. If it's a subject you are interested you can also answer questions.