If it is a 2021 form, the amendment software won't be ready until the end of the month. If it is for a previous year, click on the year in the instruction link. This link has the full instructions for all years. You will amend the federal return to add the 1099-R, and TurboTax will update the information and prepare amended state forms if necessary.
Where do I enter my 1099-R? Your 1099-R will already be there, so you will click on Edit and update the information from the corrected 1099-R.
You have three years from the date you filed your return or two years after you paid the tax due (whichever is later) to file an amendment.
Wait until your original return is fully processed and you receive any refund you have coming before doing the amendment.
@Pamurray
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