To use QuickBooks Online Payroll with Buddy Punch you will also need a QuickBooks Online Plus account. The "Plus" with QuickBooks allows you to transfer time activities. Without it, QuickBooks doesn't allow the importing of time.
Please follow our other help articles to first integrate QuickBooks Online with Buddy Punch. This includes syncing your employees and then transferring time from Buddy Punch to QuickBooks Online with the click of a button.
After that occurs you can sign into QuickBooks Online and click on the "Run Payroll" button. Your time is already there waiting for you.
Here is a video showing you how to run Payroll after you hours are transferred. To validate hours in QuickBooks you can use you reporting options and search for the Time Activities by Employee Detail report.