If your site sells products, genuine customer reviews will help you to gather more sales. Magento provides good review functionality, which is often not enabled for star ratings by default.
It is easy to tell if your review stars are enabled. Simply browse to a product and try to add a review. If your review entry screen looks similar to the image below, then read on and I will tell you how to fix it in a jiffy.
Save your work and then on the front-end browse to another product and try to add a review.
If all went well, your screen should now have a row of stars! And will now look like this: