Just as a meta note, if you click the timestamp of the post, you'll be taken to a page with a comment box. HN has some rate-limiting where it hides the comment

Just as a meta note, if you click the timestamp of the post, you'll be taken to a page with a comment box. HN has some rate-limiting where it hides the comment box for some period of time, but you can get around it by clicking the timestamp next to their name.