Hello wmvsoffice,
To do this, you should rollback the payroll so that you can correct the number of hours entered for the employee. You can then re-submit the payroll to HMRC as a correction to an earlier submission so that this will overwrite their existing submission for this period.
If you're unsure how to do this, please let us know if you are using the Standard or Advanced version of Payroll within QuickBooks so that we can provide the steps below.
Thanks