Both, on the Wage & Income page, there is a Retirement section with separate menu selections for putting in:
1) Pension 1099-R forms...inside of which you will select the RRB-1099-R
......and a second menu selection for entering
2) SSA-1099 and RRB-1099 forms
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*