Fill out form 1040-X if not previously filed with Turbotax

I’m trying to file form 1040-X to amend a tax return that was not previously filed with Turbotax. Do I have to enter all the information on my original tax return before selecting “amend tax return”? It was giving me some issues : not populating my original amount (column A) and line 16 (total amount paid with original return) on form 1040-X…