Once you have selected to amend a return, you are not limited by the list of options that appear on the next page. That list is just for your convenience. Now you can literally make any changes to your return that you could make while you are actually doing your return for the first time. If you want to specifically update your SS distributions from a 1099-SSA, just go to "personal income" select the 1099-SSA option and follow the steps from there. Turbo Tax knows whatever changes you make, that they belong with the amendment.
