In order to link your Facebook page to your Get More Reviews tool, you need to ensure that you have the "Reviews" tab turned on. 

Turning reviews on for your Page lets anyone logged into Facebook publish a review on your Page, see your Page's star rating and see reviews shared with Public. Reviews help customers learn more about your business and may make your Page easier to find in Facebook search.

To turn reviews on for your Page:

1. From your Business Facebook Page, click "Settings" under the left-hand "Manage Page" menu.

2. Click "Templates and Tabs" under the left-hand "Page Settings" menu.

3. Click to toggle the "Reviews" tab on.