Retirement tax questions

I think you are trying to enter a substitute Form 1099-R in TurboTax. You can do that as follows: 

1. Go to the personal income section of TurboTax 
2. Find the Retirement Plans and Social Security menu option
3. Start or Update IRA, 401(k), Pension Plan Withdrawals (1099-R)
4. Choose Add Another 1099-R
5. Choose I'll type it in myself
6. On the screen that says Tell Us Which 1099-R You Have choose I need to prepare a Substitute 1099-R

After you complete the Form 1099-R entries, later on you will see an option to complete Form 4852.