if you were due a refund it is now forfeit due to late filing. If you owe the tax authorities can come after you at any time. Turbotax does not support 2017.
to get w-2
1) contact your employer
2) the IRS may have a transcript you'll need to register if you haven't done so already
https://www.irs.gov/individuals/get-transcript
3) pay for copies from the Social Security Admin
https://faq.ssa.gov/en-us/Topic/article/KA-02501
If the total amount of income you earned for 2017 was less than the 2017 standard deduction amount, you were not required to file a tax return, so you do not need to worry about it unless you made more. If you had tax withheld, sorry, you are years too late to receive a refund. You had three years to file and receive a refund, which has now been forfeited.
2017 Standard Deductions
Single $6350 (65 or older + $1550)
Married Filing Separately $6350 (65 or older + $1250)
Married Filing Jointly $12,700 (65 or older + $1250@)
Head of Household $9350 (65 or older + $1550)
(Also + $1600 if blind)