Oh, good lord... I finally got into the Alpha... UX fail...
I decided to try the whole installation process over again with someone else looking over my shoulder. I got to this screen. I kept hitting VERIFY but nothing happened. My friend said, "Maybe that's a text box?"
"Where?" says I.
"There, in that empty space. Above where it says 'Enter token'. "
So I tapped it. And, lo, the gates did open.
Take a look at the picture below. I thought I had to hit VERIFY to get to the text entry, and that's where I got stuck. Now, in retrospect, I feel like an idiot. But I wish that someone from the development team had at some point this month gotten back to me to help figure out what was wrong. I thought I had a bad Alpha key.
Anyway... I'm in now.
I suggest you make that field look more like a text box. On the other hand, maybe you don't want to -- it'll keep idiots like me from joining the game. Less money, but maybe better gameplay? :-)