Review Stream is a way to automatically have all of your 4 and 5 star reviews stream to the testimonial section of your webpage. Set up is pretty easy, you just need to copy and paste the code snippet into your website. Or send the code snippet to your web person for the set up.
To get the code snippet, go to you dashboard> Click the Widgets Tab, scroll down a ways until you see the image below, it will even show you a preview of what the script will look like.
If you want to Remove a 4 or 5 Star Review from your review stream feed, go the Reviews Tab of your dashboard, it will show all the reviews, simply click the green check mark button, when you hoover over it - it will say "hide review." See Picture Below.