To enter X's traditional IRA contribution credit in TurboTax, to either take a deduction, or track your basis if your income is too high to take a deduction.
Follow these steps in TurboTax Online:
Navigate to Federal > Deductions & Credits > Retirement and Investments > Traditional IRA and Roth IRA > Start or Revisit
Choose Traditional IRAbox and select Continue.
On the Is This a Repayment of a Retirement Distribution? screen, choose No.
On the Tell Us How Much You Contributed screen, enter the amount contributed and select Continue.
On the Did You Change Your Mind? screen, select No, then answer the questions on the following screens.