Select the Insert menu then click More Gadgets.
Open up the Insert menu in the Google Sites Editor You will be able to see a list of gadgets you can add to your site, like Links, Tables, and Images. Find the More Gadgets option, and click it. This lets you add editable tools such as the POWr Facebook Feed to your page.
Copy and Paste URL
You will see the Gadget manager. Choose Add Gadget by URL. Then add this exact URL into the field. Select Add to finish.
After you add your new Facebook Feed Widget to your page, you're probably going to want to adjust the shape and size of your Widget. Use the different options in the window to select the height and width of your plugin. You can also choose to add a border, scrollbar, or title around your Facebook Feed Widget, but we don’t recommend it. You'll have more control while editing right through the plugin itself.
Set up POWr Facebook Feed
Visit your live Google Sites web page and click the Settings Icon in the upper right corner of the Facebook Feed Widget.
In the POWr Editor, click Import Existing Facebook Feed, find Facebook Feed- and click Copy.