Filed last year before I recieved a 1099-NEC how do I go about this, this year?

Last year I filed my taxes, everything was accepted and I got my return etc. I totally forgot about a 1099-NEC that I had and did not amend or do anything about it.

This year I have my taxes ready to go but I was not sure how to go about adding this 1099 from last years taxes. 

 

Do I still need to file an amended 2023 return? I read something about there being a 3 year time period you can do this from the original filing date

 

With that being said I tried to work on amending and its then asking me to fill out a bunch of business stuff?? I am super confused why I cant just add my 1099-NEC and pay the difference.