I cant press the button, and haven’t been able to since downloading. Anyone know anything about it or how to fix?

Hi and welcome to forum :)

this icon just tell you that monsterwood have gems where you watch ads and get 1 gem each

But to have this feature in the first place -- mean monsterwood - your game should be 20 day old so if you just started you have to wait 3 weeks before you can get gems from it