Once you're on the app and have set your primary role as a 'Driver', check the Trips section to see you're upcoming rides. By clicking any one of your rides, you will be taken to a list of potential passengers and their locations.
You need to 'Accept' the passengers first, if you are happy with the pick up and drop off locations. They will then confirm the ride with you.
It's always beneficial to chat with your passengers before the ride - you can do so by clicking the contact icon (💬 ) to the right of their name.