Don’t know what RMD is. Took none. Only took annuity distribution income

Perhaps.  What is your age?  Are you reporting a distribution from a retirement account?

Required minimum distributions (RMDs) are the minimum amounts you must withdraw from your retirement accounts each year. You generally must start taking withdrawals from your traditional IRA, SEP IRA, SIMPLE IRA, and retirement plan accounts when you reach age 73.

See also here.

It’s probably like a pension.  Say all of it is the RMD.  When you turn 72  it will ask you if it is the RMD.  Say yes.  Anything your pension pays you is considered to be the  RMD.  Traditional pensions automatically fulfill the rules of an RMD. So for the RMD question put in the same amount as in 1099R box 1.