From your WordPress dashboard, navigate to Facebook Feed and click Connect a Facebook Account. You will need to login to your Facebook account.
The other way to connect your Facebook Feed is to do so manually. Navigate to Facebook Feed and enter in your Facebook ID. Then click Manually connect account and follow the prompts.
Click Save Settings & Clear Cache when finished.
To display your connected Facebook feed on your site, type the shortcode [facebook-feed] into a widget, page, or post.