Yes you can re-schedule, subject to availability. The fastest way to re-schedule is to click on the green 'RE-SCHEDULE' link in your 'booking confirmation' or 'booking reminder' email and self-service rescheduling online.
If you require further assistance you can contact Scene To Believe Customer Support via the chat box
here (click on the 'Chat Now' blue button to launch) or phone Customer Care on 02 9054 2636.