To vote in a poll, simply select which option you want to vote for, and click the [Vote!] button. You may view the current results for a poll before you vote by clicking the 'View Results' link. Voting in a poll is entirely optional. You may vote for any of the available options, or cast no vote at all.
Generally, once you have voted in a poll, you will not be able to change your vote later, so place your vote carefully!