Select STEP 1 - Pay Run.
Select Actions > Edit for the required Pay Run.
Amend the Pay Day Date, as required.
Select Ok.
Once Ok is chosen, the Your Pay Run is Currently Loading Warning Message is displayed.
Once the Your Pay Run is Currently Loading Warning Message disappears, select STEP 2 - Payees.
Lastly, select STEP 7 - Notify ATO and refer to How do I post the Pay Run and send my STP Lodgement?