Enter a 1099R under
Federal Taxes on left
Wages & Income at the top

Then scroll way down to Retirement Plans and Social Security
Then IRA, 401(k), Pension Plans (1099R) – Click Start

If you are filing a Joint return be sure to pick which person it is for.

It's just as fast and easier to manually enter your W2 or 1099. Don't type the bank name or try to import it.
At the bottom pick - Change How I enter my Form

Then on the next screen pick - I'll Type it in Myself

I have already submitted my Tax forms. I missed this 1099R.

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@jacgeo1982 wrote:

I have already submitted my Tax forms. I missed this 1099R.

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You will have to amend the 2020 tax return that was filed to add the Form 1099-R.

An amended return, Form 1040X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ on amending a tax return originally completed and filed using the 2020 TurboTax editions - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/01/27439

You can amend your return to include the 1099-R.  For instructions, please see this TurboTax Help article:  How do I amend my 2020 return?