The voting page is now open. As a reminder, you must play at least half of the games to vote (five games, this year) and you must vote and confirm your ballot by May 11th, 2014. Authors are not allowed to vote, but beta testers (and anyone else) can!
Alright, so apparently anyway CAN vote, but you have to play at least half of the games involved first.
http://www.springthing.net/2014/
Is the link. Just scroll down to where you see "Vote", and it gives a link to the voting page. From what I can tell, you have to vote for everything at once, so I'd recommend keeping track of the scores you give each game, then voting all at once. Deadline isn't until May.11th, so you have plenty of time.