Enter your 1099R's one at a time. After the first one, click Add 1099R.
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.
As for the accounts that did not send you a 1099R---please explain. Did you take money out of those retirement accounts in 2023? If they have not sent you a 1099R, have you looked on their web site at your account to see if there is a 1099R that you can print out for yourself? Have you called them to ask how to get the 1099R?