When preparing the STEM OPT application, print the Application Checklist as a reference for assembling the required materials. You can find I-765 form here.
REMINDER: The STEM OPT Extension application must be received by the USCIS within 60 days of the date on which ISSS issues an OPT I-20. If filed with USCIS after 60 days of the STEM OPT I-20 issuance date, your application will be denied.
If you later decide not to mail your STEM OPT application (Form I-765 plus supporting documentation) to USCIS for any reason, please notify an ISSS advisor immediately so that we may timely cancel your STEM OPT recommendation in SEVIS. Failure to inform an ISSS advisor that you are not applying for STEM OPT can cause problems in the future.
While STEM OPT is pending, we strongly advise against changing the address listed on Form I-765 because your documents may be sent to the incorrect address. This will require you to file a new STEM OPT application with a new fee. We suggest you use the address of someone who can receive mail on your behalf - remember to put "c/o", followed by the person's name and address, on Line 3 of Form I-765. The US Postal Service will not forward USCIS mail.
Once your application had been mailed you should review the STEM OPT Reporting Requirements.