I was just using my free WoF spin from the mail and then after using it I went to freebitco.in.
I noticed this banner on the homepage which consists of the "Play Now" button but upon clicking on it nothing happened.
I guess it is supposed to open the free WoF spin but since I don't have any may be that's why it did nothing.
I think it's just referring to the hourly free roll which if you use enough times during the time left shown above will reward you with golden tickets, see the banner above the timer for details.
If you're scrolled down the page a bit and that banner and timer are out of view clicking on it scrolls you back up to them.