To see which widgets are being used on a specific page we first need to follow this steps:
1. On your backend, click on Visit Website.
2. This will send you to the homepage but with one additional bonus, it will show the Admin Bar to your Left.
3. Click on the Magnifying Glass with the + Sign inside of it (Plus sign). It will render the page again but this time, it will show all Active Widgets used on the Page you are one:
Now you can simply click them to go to the Widget Manager and add then to your My Widget list to start editing them if you need.