I have started the FAFSA, but the school I am attending is not listed when I try to choose a school. Will I still be able to use the Pell grant and student loan even if the school is not listed?

Every school that participates in the federal financial aid system has a 6 digit Title IV code assigned by the Education Department.
If your school does not have a T-IV number then you cannot receive the federal aid.
You should check with your school's financial aid office to get their T-IV number, it may be listed differently than the way you tried to enter it.