you can't in Turbotax since it doesn't have them. You could open each year's return and print out the w-2 worksheets
or
you could get copies from your employers
or
you could register with the IRS and get w-2 transcripts (no state/local info)
or
you could pay the Social Security Adm a fee and get actual copies for $126 per request
https://faq.ssa.gov/en-us/Topic/article/KA-02501
