Ah!
Quite simple really. If you hit the weekly contest post, it has the details. All I do is create a post, put a few pictures about beer, use #beersaturday as a post, and let 'er rip. As a bonus, reply to the post with a link to your post and then check out the other posts.
Not too much involved and good drinkin' company.
Okay, I will check it ;)