Within the Products Reviews link find options relating to your product reviews settings.
Allow Product Reviews: check this box to allow product reviews to be written and displayed on individual products on your site.
Show Product Reviews on Site: check this box to allow the product reviews written for individual products to be displayed on your site.
Moderate Product Reviews: check this box to be able to moderate and read through reviews written by customers for specific products before posting them on your site.
Allow Product Rating: check this box to give the customer writing the review an option to rate the product.
Allow Karma Score: check this box to give the customer writing the review an option to rate the karma score of the product.
Show how many reviews at first: type the amount of reviews you would like displayed on individual products.