After a completed Spinr trip, use the trip-completion screen to select a rating from one to five stars and add feedback before submitting. Check your selection before sending it: the app does not currently let you replace a submitted rating by rating the same trip again.
If you made a mistake, email support@spinr.ca with the trip date and the correction you would like reviewed. A correction is subject to review. Report safety concerns through the app's safety options so they can be handled appropriately.