The instructions you are looking for can be found Here
The quick answer is:
1. Go to the page that the widget is visible on.
2. Look in the addressbar for a "?"
3. If there is already a "?" in the URL of the page, add "&tp=1" to the end, if not, use "?tp=1"
4. Hit "enter"
5. Locate the widget after the page reloads.
6. The widget ID will be displayed above the widget, copy/paste that into the admin area for the widget style you want.