Choose Insert, then More Gadgets.
In the Google Sites Editor, open the Insert menu. You should see a list of available components and gadgets you can add to your site, like Images, Links, and Tables. Select More Gadgets. This will let you add editable tools like POWr Instagram Feed to your site.
Paste in URL
You will see the Gadget manager. Choose Add Gadget by URL. Then paste this URL into the field. Click on Add to finish.
Change Height and Width
Now that you have embedded your new, fully customizable Instagram Feed Widget onto your website, you'll probably want to change the shape and size of the Widget. Use the options in the pop-up to choose a height and width for your plugin. We don't recommend it, but you can insert a scrollbar, title or border to your Instagram Feed Widget. There is more editing control through the plugin itself.
Set up POWr Instagram Feed
Go to your live Google Sites web page and click the settings gear in the top right corner of your Instagram Feed Widget.
In the POWr Editor, click Import Existing Instagram Feed, find Instagram Feed- and click Copy.