Once installed, the module 'll display the google opt-in form on your order-confirmation page. This can be a little scary : some merchants are not really enthousiasts because some of their products are sometimes not appreciated by their final customer. In that way the module affords you to choose which product 'll trigger an inquiry from google services.
A form is available on each product pages of your backoffice, affording you to choose if the product, when taking part in an order, 'll trigger the opt-in form.
You can also choose the position of the opt-in form and also inform Google (as it is required in the customer review program) about your delivery time in day in each of the available countries (and their states) of your shop.