Hi S&B ,
Can't seem to get my screen capture working but there are two main ways to access the review feature.
Firstly;
on the main stock page, click the little '+' to expand a car, then there is a big button for the review there.
Secondly;
You can then click on any vehicle and right at the bottom of the 'vehicle details' screen there are 4 buttons.
1) 'Set to due in'
2) 'Mark as sold'
3) 'Request review'
4) 'Save'
Obviously it is the 3rd button on that one.
After you click request review, a screen pops up asking for the customer's name and email address. You enter that and then it sends an email to your customer asking for a review. The review is directly linked to that particular car, so that they can only leave one review and it is also moderated before it goes live.
I hope this helps.