Emergency: question for ETA-750B item 10

on item 10, alien is in the us and will apply for adjustment of status to that of a lawful permanent resident in the office of immigration and naturalization service at ..........

i live in california and will niw application to nebraska? how do i find out which city the office is in?

thank you very much!

my phone [phone] if calling is easy for you to explain. i am going to mail the package out tomorrow. really appreciate your help.