Re: How do you know if you won a contest?
To enter a contest (for official contest) you post you entry on the thread. Or for certain contest you email your entry to the admin hosting it(usually for pants & shirt designing) And then a week or so, they'll make a new thread in that same forum, posting the winners.
For unofficial contest, you will have to read the rules but most of the time you post you entry as a reply. And when the contest is over, they'll make a new thread announcing the winners.