The Review Criteria settings tab allows you to add unlimited custom criteria fields to your review, each field will presented by a range (blue for author, and orange for users submitted reviews). You must specify the criteria fields in order to allow users to submit their reviews according to it.
Each field require three values as the following:
- Unique ID (this id will be used by the plugin to define each field)
- Title (the title that will be displayed)
- Rating (a percentage out of 100)
This is how it looks in the Review Settings post meta:
Once you added the criteria fields and published your review, the comment section (where users can submit their reviews and ratings) should look like this: