After you file


@Mercury12 wrote:

How to print my 2016 2017 and 2018 taxes


Were they prepared in Online TurboTax?  If so, log in and go to the section "Your Tax Returns & Documents".  Expand that section and choose each tax year you need to print.   Under each tax year look for a link "Download/print the PDF."

 

The 2018 return should be free to download/print since it is still current.   2016 and 2017 may or may not be free to download/print, depending on what edition you have been using each year.   If you have been using Free Edition, and if 2016 and 2017 are locked, we can tell you how to unlock them, or how to get free 2016 and 2017 tax return transcripts at the IRS website.