As @rjs mentions the forms are not approved/released yet. Once those forms are implemented you will visit the "Retirement" topic in the "Wages and Income" tab. If you have Forms 1099-R for TY2021 distributions, you can enter them as usual.
If not, you just select "NO" when asked if you received a 1099-R.
At either point, you will then be asked about prior year "Disaster Distributions." Follow the prompts from there to enter the second installment of your distribution.
Here is a link to the TurboTax forms availability page where you can monitor the implementation status. It will be a Form 8915 for TY2020 distributions.
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