Booking a driver is quick and easy with CitizenShipper. Just go to your messages and you'll find the Book Now button in the message thread that you're having with the driver. Here's an example:
Of course, all the offers (and service fee) will vary depending on what you and the driver agree to. So the example above likely shows numbers that will be different to yours.
Finding your message thread should be very easy. Whenever a driver messages you, you'll receive an email and SMS notification containing a link. The link will take you to the correct message thread where you'll find the Book now button on the right side of the page.