The claim button appears at the very bottom of the page above the last ad, but only after you've waited about 30 seconds to a minute. As you can see below, it's very hard to see, and almost deceiving.
Combine that with the popup ad, safety limits, and low referral commission, this is a horribly designed site that didn't take the user experience into consideration. It's purely to flip a profit for the admin, as he is still getting paid for the captcha solves and the ads based on the time we spend on that site.
Shame on you, admin.