Select the Insert section and then click More Gadgets.
Open up the Insert menu in the Google Sites Editor You should be able to see a list of available gadgets you can install on your site, including Tables, Links, and Images Click on the More Gadgets option. This lets you add editable tools such as the POWr Video Gallery to your page.
Copy and Paste URL
The Gadget manager will be visible. Click on Add Gadget by URL. Then copy and paste this exact URL into the box. Click Add to finish.
After you add your new Video Gallery Widget to your page, you're probably going to want to adjust the shape and size of your Widget. Using the options in the pop-up window, choose the height and width of your plugin. If you'd like, you can add a border, title or scrollbar to your Video Gallery Widget, but we don't advise it. You'll have more control while editing right through the plugin itself.
Set up POWr Video Gallery
Visit the live Google Sites website and click the Settings Icon in the top right corner of your Video Gallery Widget.
In the POWr Editor, click Import Existing Video Gallery, find Video Gallery- and click Copy.