The Facebook Comments widget enables visitors to leave comments on your site using Facebook. Comments can promote interest and discussion on your site and give visitors insight into what other visitors think of your service or product.
To add the Facebook Comments widget to your site:
In the left panel, click Widgets.
Click and drag the Facebook Comments widget into your site.
To learn more about adding widgets to your site, see Add Widgets.
To access the design editor, right-click the widget, and click Edit Design.
Select Light or Dark for the color scheme to customize the appearance of the widget.
For information about design options that are not specific to this widget (for example, layout, style, or spacing), see Widget Design.