TurboTax does not have your 1099R. If you entered it when you prepared your tax return, the data you entered is on the worksheets you saved with the pdf of your return. Or you can ask the financial institution that issued it for another copy. You might be able to go online to your retirement account and print out a copy yourself.
Or since your question is not quite clear, are you looking for how to import a 1099R into a 2018 return that you are just now working on? Some of the financial institutions have taken down the 2018 information this late in the year. You will have to check to see if yours still has it available for import. If so, you will need the account information and password that you normally use to access your retirement account online.
To enter your retirement income, Go to Federal> Wages and Income>Retirement Plans and Social Security>IRA 401 k) Pension Plan Withdrawals to enter your 1099R.