If you want to add additional social handles to your account, navigate to settings > organization or team settings, and then click social handle.
From the drop down at the bottom of the page choose the type of social hande you want to add and click “ok”.
Select your social handle and then click add.
In the case of Instagram and Twitter make sure to accept the permissions required in the pop-up window.
In the case of Facebook we’ll automatically pull in all Facebook pages that you have the proper permissions to - if you don’t see a Facebook Page that you should have access to please double check your permissions. If your organization uses multiple business managers - you must get the proper permissions from the Business Manager that OWNS the Facebook Page or Ad Account.