Select the Insert section and then click More Gadgets.
Open up the Insert menu in the Google Sites Editor You will see a list of components you can embed on your site, like Tables, Images, and Links. Click on the More Gadgets option. This will let you add editable tools like POWr PayPal Button to your site.
Copy and Paste URL
The Gadget manager will be visible. Select Add Gadget by URL. Copy and paste this URL into the box. Click Add to finish.
After you add your new PayPal Button 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, pick a height and width for your plugin. If you'd like, you can add a border, title or scrollbar to your PayPal Button Widget, but we don't advise it. There is more editing control through the plugin itself.
Set up POWr PayPal Button
Visit the live Google Sites website and click the Settings Icon in the upper right corner of your PayPal Button Widget.
In the POWr Editor, click Import Existing PayPal Button, find PayPal Button- and click Copy.