REWARDS FOR VOTING
You can vote once every 12 hours. For each vote you get Festival Adena. This extra item is used as a premium currency in game.
With FA you can buy Premium Account to get access to various goods and functions in game.
WHAT TO DO, TO GET VOTING REWARD?
NOTHING! Just vote and the reward will be auto delivered to one of your logged in chars.
There is well known bug on l2jbrasil site – sometimes your vote is not counted. In that case check whether you using IPv6 protocol. If you are using IPv6 – try to disable it and vote again.