I play on my mobile with no worries. Perhaps check you have the real money tab selected ( or that it is available). I tend to just use it if my laptop is not available and I want to play a freeroll. Otherwise I much prefer to play on my computer
Yes, you can play for real money if you download the apk from their official site. Although some have criticized this mobile application, I think it is the best and most convenient poker mobile application. Of course, there is no flexibility to view information about tournaments and to participate in several tournaments at the same time is not as convenient as with a PC... but this is because the phone screens are small. Other rooms have mobile clients of much worse quality and navigation.