From USC Admission FAQ-
"
If I apply online... how do I provide the other required documents?"
"Other required documents, such as the High School/College Transcript Request and the School Report, can be downloaded and then printed so that you can mail them later."
USC Undergraduate Admission - FAQs
You can download the forms here (see 2-7, Counselor/Teacher report is #5):
USC Undergraduate Admission - Freshmen