Create a USCIS account (or log in to your existing account) and select "File a Form Online." Select the "I-765 ... would select ‘Yes’) or on your own after you receive your OPT authorization (in which ...

If you file your OPT/STEM OPT application by mail, you must complete a paper Form I-765, Application for Employment Authorization, and follow the U.S. Citizenship and Immigration Services (USCIS) ...