1. You have to apply for it.
Applying for financial aid at most private schools is a separate process from applying for admission to the school. You also need to make sure that you apply early. This is particularly important if the school has no specific admissions deadline or rolling admissions. Each school has allocated a specific pool of funds for financial aid. Once it is spoken for there generally are no more funds in that academic year.
This video explains how to apply for financial aid.