To run your ad, you need to set up payment on the side of the ad service.
Go to CRM Marketing > Facebook Ads or Instagram Ads.
At the bottom of the page, click the Ad account button.
Read more about ads creation in the article Facebook and Instagram ads in CRM marketing.
When you are in your account, click the Facebook Ads tab.
Select Billing in the menu.
Click Payment Settings.
To set up payment, click Add Payment Method and specify your payment data.
Read more about ads cost in the article How Ad Billing Works on Facebook.