Change Flights: Modify your flight dates, times, or destinations.
Cancel Flights: Cancel your booking if your plans change.
Check-In Online: Complete your check-in process before arriving at the airport.
Add Extra Services: Purchase additional baggage allowance, select seats, or request special meals.
View Itinerary: Access and print your travel itinerary for reference.
... https://getmesky.com/qantas-airways-manage-booking/