To check your FinAid package online from nyu first make a NyuHome account (which gives you an @nyu.edu email address). Then here:
https://ofaas02.reg.nyu.edu/NetPartnerStudent
Put your NYU ID in (starts with an N, its the one on the Candidate's Reply Form you received with your acceptance letter) and click "Receive pin by email". Check your nyu email and you'll find the pin.
I hope for your sakes that your aid package is better than mine.
Cheers