It's still simple. Just like a real life lotto, you simply buy a ticket (one or many, it's up to you.) Then you wait a week. Either you win, and you get the prize sent to your bitcoin address, or you don't win. You don't even need to post any verification as the blockchain is proof and verification that you got a ticket.
It only gets complicated when you want to figure out the best strategy to buy as many tickets as possible, thereby increasing your chances of winning.
People like to think, when all they really need to do is just buy a ticket, as you can't win a game if you don't join it.
Does that make sense?
The best strategy is to max out. If you can buy 20 BTC, do it. That gives you more than 3000 (three thousand) tickets if you bought it early, and the other players who want a chance of winning will buy more. The pot gets bigger, faster. But you have the best chance of winning. (until another player decides to buy more tickets than you.)
Of course, this is gambling, so don't put in what you can't afford to lose.
I will post tomorrow the confirmed tickets. From just eyeballing it, there are at least 26 or 28 tickets. Jackpot is 0.31689 BTC.