After you file

Yes, I read those articles before I started. The answer to this issue I am seeing  is not in those articles. I am opening the forms to see how they read and I do not see a 1040x. It says I can emend and efile but I don't want to do that if the wrong form is selected for filing. Why don't I see a 1040x in this filing or in my case a 1040SR-X or whatever that is called?