If you didn't add your payment details when you signed up, or if you want to change it, you must send a support ticket to update it.
This is for security reasons, so that no one else can log in to your account if they get ahold of your password, and change the payout details.
Once you add the information, it will stay, so you only have to do it once (unless you change it with another ticket later).
Use the same email address to send the ticket, as the one your Hungry For Hits account is registered with.
If you want to get your payouts to Paypal:
If you want to get payout in Bitcoin:
You can see what information is currently registered with your account on the "Our info about you" page under the Account tab.