You enter the Form 1099-R in the Wages and Income section of TurboTax, then Retirement Plans and Social Security, then IRA, 401-K, Pension Plan Withdrawals (1099-R). In that section you will indicate that your distribution was from sources other than an IRA, but it will be referred to as an IRA nonetheless.
After you input the Form 1099-R information, you will eventually come to a screen that says Any Nondeductible Contributions to your IRA? to which you will answer "yes".

Later, you will be asked to enter the basis (non-deductible contributions) to your IRA at end of 2023 and the value of your traditional IRA's at end of 2024. Turbo tax will use that information to determine the taxable amount of your distribution and enter in on line 4b of your Form 1040.
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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