1. Click "Marketing"
2. Click "workflows"
3. Click "Create Workflow"
4. Click "Continue"
5. Click "Add your first action"
6. Select "Facebook - Add to custom audience"
This action allows you to add a contact to a 'custom audience' on Facebook.
Select "Facebook account id"
Select "Facebook Customer Audience ID"
"Add to customer Audience - Facebook" is added
7. Select "Facebook - Remove from custom audience"
This action allows you to remove a contact to a 'custom audience' on Facebook.