1. Log in to your Merchant Center and navigate to the "Contacts" tab
2. Click "Show filters" next to the search bar
3. Click the "Campaigns" drop-down menu that appears and choose "Source"
4. Click the purple drop-down menus to build a sentence indicating which contacts you'd like to see
5. Click the purple "Filter" button to display a list of contacts added from your chosen source
Search Strings: contact source, contacts source, source of contact, source of contacts, where contacts were added from