Step 1: Go to Rivyo Product Review app--> Settings --> Users.

Step 2: Click on Action and you will see the option to verify. You can verify all users of 1 page at a time by selecting all you will see the option Approve/Disapprove

Note: If you want verified sign in your review section then you must have to check users are verified and the verified sign option in settings is on or not. 

Please click here to see General Settings. (you will see 3 rd option mentioned in a document for verified sign)