Click on the tab Forum Index at the top. Once there go under General Discussion and News. You will see the monthly photo contest under the sub forums. Good luck.
I found the thread. What are the rules as far as the time of the month I can submit a photo? I know some contest allow you to submit at the first half of the month, and vote at the second. What are the rules for Frog Forums POTM Contest as far as when I can vote?