Select STEP 1 - Pay Run.
Select Actions > Edit for the required Pay Run.
Amend the Pay Day Date as required.
Once Ok is chosen, the Your Pay Run is Currently Loading Alert (Modal) is displayed.
Once the Your Pay Run is Currently Loading Alert (Modal) 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?