So, explanation: the patron review functionality has not been a priority here. We were collecting reviews in the past but then we didn’t have anything to do with them so they just got removed at the end of the program. We investigated Goodreads integration but it doesn’t take very much clicking to find inappropriate content on Goodreads so we kind of stepped away from that. (I realize this doesn’t help you and I’m not trying to talk you into or out of anything, I just want you to know why that functionality was there and it probably doesn’t function now—it’s bad on me for making a feature that worked not work anymore).
I know @justinm has been working on review functionality because that was important over there, maybe he can provide some indication what his progress is on getting that functioning.