Voting for proposals is relatively straightforward. Head over to the Gnars snapshot, select the proposal you want to vote on, and the select your vote. You will then be shown a prompt that tells you your voting power and gives you an option to leave a comment.

You can add a comment if you desire, but it is not a requirement. It does help athletes and builders get feedback on why you are voting the way you are, so if their proposal does not pass it can provide them with valuable information on what they can do better moving forward. Once you've finished your comment, click 'Confirm' and then you will be prompted to sign a transaction verifying your official vote.