I have a trip booked where one of the flights is a QF MEL-BNE. The whole (flex Y) ticket was booked though EK and the QF flight has a EK codeshare flight number.

Does anyone know if you can change flights at the airport in MEL to an earlier flight without charge? I know that if I do it though the EK homepage, it wants to charge me 600DKK as a change fee.