If the pay run is not yet finalised you can edit or delete it in QuickBooks Online Payroll. If you've finalised and lodged the pay run to the ATO, you'll have to create an ad-hoc pay run to correct it.
Here's how to unlock and delete the pay run:
Under Employees tab, click on Pay runs.
Select the specific pay run.
Click on Pay Run Actions, and click on Unlock.
Enter a reason for unlocking the pay run, clicking OK.
Click on the Delete Pay Run button.
Click on Delete.
Once the pay run is deleted, the action cannot be reversed. And you'll have to recreate the pay run.
If you've finalized and lodged the pay run to the ATO, you'll have to create an ad-hoc pay run. You can check the articles below for more detailed information: