If you are referring to your 5-digit pin to e-file, the IRS has discontinued the e-filing PIN option. To verify your identity for e-filing, you’ll need to use last years AGI. If you are referring to your 6-digit IP (Identity Protection) Pin, you can retrieve that online at the IRS's Get an IP PIN site, or call the IRS at 1-800-908-4490 to have an IP PIN mailed to you.
ok, the website answer was absolutely no help.
where can I find last years pin?
To verify your identity for e-filing will use last year's adjusted gross income (AGI) as your PIN.
If you do not have a copy of your 2018 tax return you can get one from TurboTax it will have your AGI. Follow thee steps to get a copy of your prior-year tax return.
Sign in to TurboTax making sure you're using the same TurboTax account (with the same username) as in prior years.
Select Documents from the navigation when it appears.
Use the drop-down menu at the top of the screen to choose the tax year you want and then select Download PDF.
This link How do I access a prior year return? has additional information that you may find useful