If you want to change one entry in the form, you have to go all the way through every question again. My main concern, however, is that this product is advertised as free filing and even with discounts, I had to pay $75 just because I have an HSA account. NOT a free service.
I have used Turbotax for many years, but I had one issue this year. I filled out the info on Jan 30th to Feb 1st and got a statement from Turbotax saying the IRS has a form that was not available yet and I would be notified as soon as it was available. I looked up my account today and low and behold I could file today, but I was not notified that the form was now available. Maybe it is a coincidence of timing.