This is up to you. You can call the passenger directly using a virtual number using the steps here. The passengers can track your progress to the pickup point, so they should be waiting when you arrive.
GreenRide Sharing was founded in 2016 with a mission to revolutionize car sharing for inner city Exeter journeys using technology. We want to make urban transport accessible, affordable, convenient and green in Exeter. The GreenRide mobile app will be the only UK carpooling platform that allows drivers to offer and passengers to request rides in real time.