I'm glad to see you here, @amgregory123. Yes, the 10-digit PIN you'll enter is the one from the IRS to submit your tax forms online.
If you don't have a copy of it, you'll need to reach out to the IRS to obtain the PIN.
Furthermore, to give you more details on how to electronically pay and file your forms, I've added this resource for your guide: E-File And E-Pay Federal Forms And Taxes In QuickBooks Desktop Payroll Enhanced.
Once you submit it, you can read this article to determine the progress: Check the status of your payroll tax payments or filings sent through QuickBooks Payroll.
Ping me in the comment section if you have additional questions about e-filing tax forms in QuickBooks. I'd be delighted to assist you. Take care, and have a good one.
