Sorry, Tapas uses Paypal to pay creators. You need to be 18+ to get a paypal, and that probably needs to be attached to a bank account. You probably need your parents/guardian to assist you in setting things up.
It's also, just FYI, a really hard way to make money, as drcharlotterodricks said. If money is the driving factor, you'd make more selling lemonade. But if you are into writing, the money is a nice potential bonus, even if it takes a long time to get profitable. And if you're willing to invest years into your writing, you never know where you'll end up.
Do your best! Good luck! Feel free to ask any more questions. =)