Hi autochrome -
Re : voting instructions -
On the first day of every month, Pavel, the forum manager, posts a new thread for voting on the photo contest of the previous month.
So, for example, next week on the 1st of May, you will see a new thread called "April 2012 - Voting", which will be the thread for voting for the April "Animal Life" contest.
Then you log in as usual, and follow the voting instructions in the thread (very simple - just click by the name of the photo/photographer). The voting is usually open for a week, and usually you can vote for up to 5 different photos.