If you have NOT filed the 2019 tax return -
To enter a 6 digit IP PIN
Or enter ip pin in the Search box located in the upper right of the program screen. Click on Jump to ip pin
If you have filed the 2019 tax return with an incorrect IP PIN then the IRS will reject your tax return. You can then correct the mistake and re-file. But only after you receive notice of the rejection.
The IP PIN is a six digit code that is completely different from the 5-digit e-filing PIN. The IP PIN will change every year. The IRS will mail your new IP PIN each year to the address on the last tax return you filed. Generally the IP PIN should be received in the first week of Feb at the absolute latest. So you have to wait. You can not get the IP PIN online and the IRS will not issue it over the telephone to you either.
If you moved since you filed your last tax return and did not notify the IRS of your new address, then you will not get the IP PIN. In that case, you will have to print, sign and mail your return to the IRS.
Now if you did move, you should also send the IRS Form 8822 - Change of Address, in a physically separate envelope (do not send it with your tax return). Get a blank form at https://www.irs.gov/pub/irs-pdf/f8822.pdf