You need to get your USC ID before you can log in and register for an event(http://www.usc.edu/dept/orientation/freshman_summer/comingtocampus.html#howto) - did you do that? You can attend the international orientation that begins right before classes start. My daughter did that and we are not international - I just could not justify the expense of a round-trip plane ticket across the country for a 3-day orientation. There were other U.S. students at that session as well. Here are the dates: http://www.usc.edu/dept/orientation/freshman_summer/deadlines.html