Can't light fire on the walking dead season 2 game?

I've been waiting to play season 2 forever! I'm playing on my iPhone 5. I can't get the lighter to flick on! I've tried everything. I'm guessing this is just a glitch or maybe I'm not doing it right? Anyway if you have played this from your phone could you please explain how to do this

For shame I don't have an iPhone, but if I get stuck in video games I would recommend you to check out the walkthrough (I hope the PC one is same with iPhone one)
Here's a link: