http://or-in.facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion/business/help/374756690038600
For example, an existing post with the call to action "Shop now" can’t be used to create a call ad. Modifying details on the ad, such as adding a phone number, will also change the information on the existing post you selected. If there is a call to action on the existing post, you can click Remove to remove it from both the ad you’re creating and the existing post.