Trying to complete 2016 and 2017. Contacted IRS and was given some info on TIN # for everything they have record of - Where do I place this TIN when filling in the W2

I am not sure what you are asking.  Your "TIN" (Taxpayer Identification Number) is your Social Security Number as it appears on your W-2.    You do not actually enter that into the TurboTax W-2 interview because that is already on the W-2 that your employer issued and any SSN information that goes to the IRS with your tax return comes from your SSN that was entered into the personal information section.