Feedback can be used just like posts to keep testimonials separate on your site.
The feedback page template pulls from the Feedback entries. These are just like posts, but separate. In this way, you can easily organize testimonials, reviews, or a collection of quotes on a simple page that lists them by date.
You can customize each post just as you would a post: add photos, text formatting, etc. These custom post types have a few different entry fields in the post editing area: Author and Author URL. Fill these in and they automatically show up on the feedback page (and in the widget).