You will see a red rectangle that says "PLAY NOW FROM MOBILE" tap on it and then it will take you to another tab, on that tab at the top on the right corner says "Log in" tap on it and then write your email address and password, and now you are log in on the mobile platform. Just chose the Jackpot you want to play. Just remember you cant log in on your mobile and from your computer at the same time.
Is there any update to this, can still only see Blitz and Jackpots, not regular tournaments. It's odd as the site seems to indicate it's pretty much the same as playing with the client. Almost seems pointless playing from a mobile unless you specifically want to play one of those two types of games that are not normal tournaments.