In order to protect your account for payment, you need to enable two-factor authentication (using the Google Authenticator app).
This will also open all payment methods that are available to players in your country to withdraw earnings.
If you do not connect two-factor authentication, then you need to tell your personal manager which payment method to connect and to which details. In this case, without two-factor authentication, the withdrawal of earnings will be available only to this fixed method and only to specific details.
All this is necessary to secure your account and your money!