Ask HN: How can I get my HN password?

When I signed up for HN, I used clickpass and associated my HN account with a google account. I'd like to associate it with a different google account now, but when I try to do so, I'm prompted to login to HN to connect to my google account. However, I've never logged into HN with a username/password combo, and I don't see a way to obtain information about my password on my account page.