Where do I report my Social security Retirement benefits, and what is the SSA's Federal Identification Number?

Your question about an identification number tells us you are trying to enter your SS in the wrong place.

Go to Federal> Wages & Income>>Retirement Plans and Social Security  (SSA1099 and 1099RRB) to enter your SSA1099.

Be sure to enter under 

Social Security (SSA-1099, RRB-1099) 

NOT "IRA, 410(k) Pension Plan Withdrawals (1099-R) "

The program will not ask for a Federal Identification Number (FIN) if entered in the Social Security section

Be sure to delete the 1099-R entry if it was entered in the wrong section.

It would be best to delete first, then re-enter.

You can remove the wrong entry by revisiting that section and clicking the delete (trash can) option

OR

switch to forms in Desktop and delete 

OR

• To Delete a Form  using TurboTax Online:
  Select Tax Tools on the left side-bar
  Select Tools from that drop-down
  Select “Delete a form” on the TOOLS CENTER screen
  Select 1099-R and delete
   

@pcsoulman