You do not report taxes paid in TurboTax from RSU's that have vested. The Federal Income Tax withheld should be reported and accounted for by your employer in Box 2 Federal Income Tax Withheld, on your W-2. So the total amount reported in Box 2 on W-2 includes the federal income tax paid with the RSU's that vested. As long as you enter that amount in TurboTax, you are getting credit for those taxes paid.
Use this link to learn more about how RSU's are reported: What are restricted stock units (RSUs) and how do I report them?
