Select the Insert menu and 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 and select the More Gadgets option. This lets you add editable tools such as the POWr Button to your page.
Copy and Paste URL
You will see the Gadget manager. Click on Add Gadget by URL. Then add this exact URL into the field. Select Add to finish.
After you add your new Button 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 decide to create a title, scrollbar or title around your Button Widget, but we advise against it. You'll have more control while editing right through the plugin itself.
Set up POWr Button
Visit your live Google Sites website and click the gear icon in the upper right corner of the Button Widget.
In the POWr Editor, click Import Existing Button, find Button- and click Copy.