Enable user reviews in WP Product Review
To enable user reviews in WPPR, visit Product Review from Dashboard.
Go to General Settings tab.
Go to Show review comment option, and click on Yes.
[Optional] Also, you can change original review according to the user review, by selecting Visitor Review Influence option, and selecting the percentage effect on the original rating.
Finally, click on Save All Changes.
Here's how the visitor's ratings are influencing the review rating in WP Product Review.