Thanks, @ErnieS0! I was a part-year NYC resident. I was able to change line 18 in the "Your City Residency Information." However, I couldn't edit line 18a, which is where the problem was. Your suggestion to delete the form and pointing me to the city residency details allowed me to delete and re-input the correct information (line 18a should have been 0, so my inability to access it was ok).
Thanks!
