Okay, I messed around with the site's FAQ, fixing some typos and hopefully making it "feel" more correct. The added/corrected parts are bolded.
To participate in this free lottery you need a Bitcoin wallet. You can get it for free by downloading and installing open source Bitcoin software from the official website. No registration is required. Run the client and copy/paste your payment address to get a prize.
You can receive the amount that appears on the main page. There is always a small amount of Bitcoins available (booby prize), but during a day in random time we are giving away more valuable prizes. See Stats section for information about prizes that will soon become available.
You can get only one bounty per day, regardless of it’s value. The term "day" refers to 24 hours, i.e. you can get a new prize 24 hours after requesting your previous prize. To know how much time you have left until the next bounty is available to you, just request a bounty and you will see an appropriate message.
For some ads, we give away prizes to the each hundredth or thousandth unique user (e.g. 100th, 200th, 1000th) who visits the advertiser’s website. When you click on an ad, your IP is recorded and an appropriate payment is sent to the last payment address you used to receive our free daily Bitcoins. If no one with the recorded IP ordered free Bitcoins, prize goes to the next user.
You must claim the prize within 2 minutes after the page has loaded. If you are too late or refreshed the page (by pressing F5), the prize becomes invalid and can be moved to another user. In this case you will receive an another bounty offer or if no more are available, the guaranteed booby prize.
I haven't received a payment. Why?
I'm not a native English speaker, but this should be more correct.