[emiljbs]

I have 157 karma and I can't downvote anything. How exactly do you downvote on HN? I've never seen anyone explain that (and I can't really see it in the settings either).

[samsolomon]

I believe you have to have about 500 karma to downvote comments.

[dfc]

For me it was: Karma = 500, the number might change over time.