Choose Insert, and then More Gadgets.
In the Google Sites Editor, open the Insert menu. You will see a list of components you can embed on your site, like Tables, Images, and Links. Find and select the More Gadgets option. This lets you add editable tools such as the POWr Video Slideshow to your page.
Paste in URL
You will see the Gadget manager. Select Add Gadget by URL. Then add this exact URL into the field. Select Add to finish.
Change Height and Width
Now that you have embedded your new, fully customizable Video Slideshow Widget onto your website, you'll probably want to change the shape and size of the Widget. Using the options in the pop-up, pick a height and width for your plugin. You can decide to create a title, scrollbar or title around your Video Slideshow Widget, but we advise against it. You'll have more control while editing right through the plugin itself.
Set up POWr Video Slideshow
Go to the live Google Sites website and click the gear icon in the top right corner of the Video Slideshow Widget.
In the POWr Editor, click Import Existing Video Slideshow, find Video Slideshow- and click Copy.