localhost, replace it with the host name or IP address of your server in the URL field.
The URL is valid for the position of the widget on the dashboard, and not for the widget itself. For example, if you get the URL for the first widget, which is a Top-N widget, and later put a Trend widget in the first position, the URL will show the Trend widget.
When you embed widgets in other HTML pages, provide at least 354 pixel width. If you use a narrower width, scroll-bars can be placed over the widget.