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Do you mean “how do I enable reviews in the catalog?” If so:
Login to your Magento Admin
Select “System > Configuration” from the top menu
In the left column click on “Catalog” (you may need to scroll down)
In the main body click on “Product Reviews” to expand
Make sure “Allow guests to write reviews” is set to Yes
Then, to view and manage reviews, go to “Catalog > Reviews & Ratings > Customer Reviews”