Login with your Littlescribe parent account from here, or create a new Littlescribe parent account if you don't have one from this link and then loginin
Connect your child account if it is not already connected using the instructions in this link
Confirm adding blank pages (book should have a minimum of 12 pages, so if the child's book have fewer pages blank pages will be added automatically to make it a 12 pages books)
Click on "Shop" to view your cart, add your coupon (if redeemed NSW creative voucher from Littlescribe), then click next

You should receive a confirmation email from Littlescribe contains your orders details
Note:
Littlescribe do the printing and shipping on a monthly basis for books ordered before 29th of each month, usually it takes 10 business days for books to be delivered based on your shipping address and the time of the year.