Oh, are you talking about Quickmatch voting? When you go to Quickmatch, there's a red "Voting" button alongside the blue "Templates" and green "Leaderboards" buttons.
You can also use the Voting list to see the ranking of templates right now, to figure out which next template you or someone else will unlock.
The way voting works: there's some templates Fizzer has fixed into the first 8 spots, so
voting is generally unimpactful- the vast, vast majority of Quickmatch players will
never unlock the 9th template. So you are just voting on what more-active QM players will see. You can accumulate arbitrarily many votes (you keep earning them, the games-per-vote curve gets steeper) but you can only vote for one template at most 3 times. Then at the end of each day (00:00 UTC), Quickmatch tallies up the votes and re-orders the templates based on which ones have the most votes. Until the reordering, you might see that some templates are ranked too low/too high given their # of votes- that's just because the rankings only get updated once each day.
The template ranking stops at 40- templates ranked #41 and below are
not in the Quickmatch rotation and can't be unlocked. That said, most players are not going to ever unlock the #40 ranked template either, since unlocking that requires at a minimum hundreds of QM games. There's some inactivity mechanism that causes players' votes to expire when they haven't logged in for a long time. Also you should not vote for a template with any alternate accounts; only your main account.
Edited 8/28/2022 19:53:08