How to turn On reviews? I can’t see any criterias in review.

First of all you need to add Reviews criterias in Apperance -> Theme options -> Reviews

Screenshot: http://goo.gl/SMok21

Also, if you expect to use different criteria for each category, you can specify different criteria in the properties of each category.

Post -> Categories -> Some category > Reviews

Screenshot: http://goo.gl/xWvnW51