Where /how do I enter my SSA1099?

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

Alternatively, at any point, you can do a Search (upper right) for ssa-1099 and click on the jump-to link (Mac user must find it in the Topics List). NOTE: just type ssa-1099 and hit Enter, don't choose any of the suggested Search terms.