Check out the Qantas website. Look for the reservation feature.
Select the flight option, then enter the desired airports and destination.
Use Qantas Airways Seat Selection by selecting a one-way or round-trip flight when making your reservation.
By choosing the search option, you can extend your search and see all of the available flight options.
Include both the total number of travellers and the complete list of passengers' information.
If you want to reserve a seat for yourself and other passengers, you will be shown a seat map and asked to choose your favourite seat.
Prior to being able to access the payment page, the Qantas seat selection fees must be paid.
You will get an email confirmation and an e-ticket after the reservation procedure is finished.