Assuming that the contribution in 2007 was for 2007 (if it was for 2006, read "2007" as "2006" in what follows), if you didn't file a 2007 Form 8606 to report your nondeductible traditional IRA contribution, the IRS is not obligated to recognize your nondeductible contribution. You should file the late 2007 Form 8606 to report the nondeductible contribution.
https://www.irs.gov/pub/irs-prior/f8606--2007.pdf
As you prepare your 2016 tax return with TurboTax, click the Continue button on the Your 1099-R Entries page, indicate that you made nondeductible traditional IRA contributions, then enter the amount from line 14 of your 2007 Form 8606 as your net basis in nondeductible traditional IRA contributions for years prior to 2016.
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