The booking page on the web site allows games which have been booked as part of the Open Singles Ladder competition to be moved by the participants to another date. This answer to this FAQ shows how to do that.
The basic steps to moving a booking are:
1) Sign into your account on the web
2) Load the Bookings page from the Menu
3) Use the calendar to select the day of the booking
4) Press the "Move Booking" button
5) Either select another time slot if moving within the day, Or
5) Use the calendar to select the day to move the booking to
6) Select the time slot you want on the new day
7) Press "Confirm Move" button to make it happen
The following video shows how this is done: