I actually have to pitch in here, mainly because I've received many messages about it in the past.
The Play Game tab is a bit out of sight, but also, some people often have it confused with actually playing the game. New players often struggle and become confused when they click on a tab that says 'Play Game,' thinking it will lead them right into the game. It also isn't said anywhere in bold that you need that tab to play, so people are left a bit clueless on what to do.
Perhaps a guide or just an instructive note may also help with this sort of issue. You guys aren't the only ones who were lost, trust me!