If you received Social Security benefits in 2017 you will soon receive a SSA1099. If you have been receiving income from a pension or retirement plan you will get a 1099R.
Go to Federal> Wages & Income>>Retirement Plans and Social Security to enter your SSA1099
Go to Federal> Wages and Income>Retirement Plans and Social Security>IRA 401 k) Pension Plan Withdrawals to enter your
1099R.