You need to apply for the EU student visa while in Pittsburgh, with the Portuguese Consulate in Newark.
The student visa takes around 3 months to be processed. Be sure that you apply with enough time to get the visa before entering Europe.
Here you can get some general information about the Schengen visas and here you can get instructions from the Portuguese Consulate in Newark. If you have any question, please talk to Mrs. Sila Santos ( ) or check the consulate's webpage (http://www.secomunidades.pt/web/newark).