Unless you can't because that box isn't there to do a password reset. Which, btw, is really frustrating as I just had to create a second account to write this. I used to use OpenID and now I can't login to my old account at all.
I had the same experience. Pretty frustrating when you don't know what's going on (I'm a pretty regular visitor and missed the OpenID thread) and then want to comment on something and BAM! You have to create a new account in order to do so.
Maybe a separate page for changes to this site? That way, if someone misses it on the front page, they don't get hung out to dry.
I'm surprised that http://ycombinator.com/newsnews.html has not been updated on this important topic. How much would it help, though? There should be an RSS of it.