Some fields won't allow entry

[jbeikirch48]

Doing an amended  '25 1040 return. On the "Annualized adjusted gross income" page, I'm prevented from filling in a field. Seems like on my original filing the forms for reporting inconsistent income through the year were not filed. Thus, I was charged a under reported situation and not refunded my expected amount. Pretty sure I can correct this with an amended return but see my first sentence.