Choose Insert, and then More Gadgets.
In the Google Sites Editor, find the Insert menu, and open it. You will see a list of components you can embed on your site, like Tables, Images, and Links. Select More Gadgets. This allows you to install customizable tools such as the POWr Photo Watermark to your site.
Copy and Paste
The Gadget manager will appear. Select Add Gadget by URL. Then paste this URL into the field. Choose Add to complete.
Adjust Height and Width
Now that you’ve added your new, customizable Photo Watermark Widget to your Google Sites page, you’ll probably want to adjust the size and shape of the Widget. Using the options in the pop-up, pick a height and width for your plugin. We don't recommend it, but you can insert a scrollbar, title or border to your Photo Watermark Widget. You will have more editing options through the plugin.
Set up POWr Photo Watermark
Go to the live Google Sites web page and select the settings gear in the top right corner of your Photo Watermark Widget.
In the POWr Editor, click Import Existing Photo Watermark, find Photo Watermark- and click Copy.