First----there was no required minimum distribution for 2020----the tax laws say you did not have to take it for 2020 due to the pandemic. But you will receive a 1099R for the distribution you took. They usually arrive in late January or early February.
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.
see IRS Pub 590B to get the divisor to use for your age.
If you turned 70 1/2 in 2020, your first RMD must be taken in the year you turn 72, and your divisor will be 27.4 (new tables take effect then).