You do not need to report your 2015, 2016 and 2017 contributions, at all**. Furthermore, there is no way to do it, even if you wanted to
If your income does not qualify you for a contribution or if your income exceeds the limit to contribute to a Roth, you need to contact your account administrator to undo the contributions (and then report the excess contributions on your 2019 return)
If you want TurboTax to track your contributions, going forward, buy the download software for 2019 (don't use on-line) and make the past year entries on the IRA contributions worksheet.
**If you want to claim the Retirement Savers Credit (it's a low income credit, most people don't qualify), you will have to file amended returns for those years. To see if you qualify, review the chart on form 8880 (https://www.irs.gov/pub/irs-pdf/f8880.pdf). Line 8 on the form is your Adjusted Gross Income (AGI).
