Below is the step by step on how to add a payment method or money to your Facebook Ads account:
Click on the Business Tools Menu (that has an icon of 9 small circles)
3. On the right-hand side corner of the screen, click Payment settings.
4. Click on Add Payment Method;
5. The window below will pop up. Choose your preferred payment method and register the payment.
Note: We recommend that you choose the payment method by Credit Card or Paypal, so the account does not risk running out of balance. Once the account runs out of money, the ads stop being displayed immediately.