Not cheerleading here, just explaining how the Voting feature currently works in Bugzilla.
You go to a bug report and click on "Vote for this bug". A table with all your (former) votes will be presented and an "Enter New Vote here →", see for example https://bugs.maemo.org/votes.cgi?act...ug_id=1#vote_1 .
One needs to be logged in for this - might be a burden to register first, might also avoid persons voting 20 times for their favourite bug. :-/

The UI is probably a bit confusing, at least one person told me.
Take a look at it, also take a look at http://brainstorm.ubuntu.com/ and add your vote to the ITt poll here or proposals how to tweak.