Choose Insert, then More Gadgets.
In the Google Sites Editor, find the Insert menu, and open it. You should see a list of available components and gadgets you can add to your site, like Images, Links, and Tables. Click on the More Gadgets option. This will allow you to add customizable tools like POWr Social Feed to your site.
Copy and Paste
The Gadget manager will appear. Choose Add Gadget by URL. Copy and paste this URL into the box. Click Add to finish.
Adjust Height and Width
Now that you’ve added your new, customizable Social Feed Widget to your Google Sites page, you’ll probably want to adjust the size and shape of the Widget. Use the options in the pop-up to choose a height and width for your plugin. If you'd like, you can add a border, title or scrollbar to your Social Feed Widget, but we don't advise it. You’ll have more editing controls directly through the plugin.
Set up POWr Social Feed
Go to your live Google Sites website and select the gear icon in the upper right corner of the Social Feed Widget.
In the POWr Editor, click Import Existing Social Feed, find Social Feed- and click Copy.