Please don't end your comments that way. I had already upvoted your comment halfway through but then on personal principle had to flip it to a downvote.
Does up- or down-voting actually do anything?
Genuine question. The app i use for hn only allows upvotes, which i do use.
Your account isn't able to downvote, so that's probably why you don't see them. The feature is unlocked when the account gets over 500 karma. https://news.ycombinator.com/item?id=17731487