if you don't have the 6 digit PIN, you can go to the IRS website to get the most current PIN. Without that PIN you can not efile.
https://www.irs.gov/identity-theft-fraud-scams/retrieve-your-ip-pin
While it is best to use the 6 digit PIN on a paper filed return, it is not a requirement. If you were issued one and don't enter it on the paper return, it will slow down the processing as it will undergo additional scrutiny.
