It says that there will be voting in the jam overview, but it doesn't seem to be present in the submission pages. Am I just dumb?

No, you are correct. I can't vote either

Hi! Yes, voting is indeed broken and we've contacted itch.io support to try and fix the issue. If it's not sorted soon, we'll advise on an alternative voting method.

Thanks for submitting - hopefully we can fix this issue soon!

what is now with the ranking?

Hey all, voting is finally up here: https://forms.gle/SVg4xtPMPQPXawY96