1) Launch Scripting, and go to Admin > Connectors.
2) Click the Connector Type button at the top-left, and select Facebook from the list.
3) Click the button to add a new Connector.
4) Add an appropriate name - Facebook connectors are split into Messages, Reviews, and Wall Posts, so it's worth naming the Connector appropriately.
5) Enter the page's @username (or ID if a @username is not available), and long-lived User Token. Select the desired interaction type from the Data Feed drop down at the bottom.
6) Click Save, and repeat for any other desired interaction types or pages.