第一步： 建立账户。注册的时候只用填邮箱，USCIS会发给你确认邮件，确认链接进去，再设置密码等。 有个Two-Step Verification Method，电话邮箱都可以。
第二步：选择account type: I am an applicant
记得选择c(3)(C), OPT extension
Two passport-style photographs (name, date of birth, I-94 card number and SEVIS number written on the back). Photos must be taken within the last 30 days and cannot have previously been used for a passport, visa, or other US government-related application. 两张护照式照片（姓名、出生日期、I-94卡号和SEVIS号码写在背面）。照片必须是在过去30天内拍摄的，而且不能是之前用于护照、签证或其他美国政府相关的申请。
If submitting your application by mail, you must get a check or money order for $410 made payable to the US Department of Homeland Security. If paying by check, be sure that your name and address are pre-printed on it. If you have to hand write in either your name or address on the check then we recommend getting a money order instead. Write SEVIS ID on check/money order. Do NOT send your money order separate from the application the money order is for. Your money order should be included with your other application materials. If submitting your application online, you will be able to pay the fee online by following the USCIS prompts.
A completed Form G-1145.
Do NOT submit Form I-983 in your application to USCIS (this is only a document OGS is required by USCIS to keep on file).
A completed Form I-765 (the link takes you to the main page for both accessing the form and the government's instructions on how to complete the Form I-765); Be sure to review our I-765 explained so that you fill out the form correctly. It’s best to type your information into the form, print it, then sign it. If you decide to file the I-765 online, review our information on filing the online I-765.
A photocopy of the new I-20 with the OGS STEM OPT recommendation on it.
A photocopy of your F-1 visa (except for citizens of Canada and Bermuda)
A photocopy of your passport identification page, clearly indicating your passport name, nationality, date of birth, and the passport expiration date
Your printed I-94 record, clearly indicating that you are in F-1 status
Photocopies of any previously-issued Employment Authorization Document (EAD), if applicable.
Official transcripts for the degree upon which your STEM OPT extension will be based.
If your STEM OPT extension application is based on a previous STEM degree, include a transcript from your previous school. If you do not have an I-20 showing the CIP code from that school, you must also include documentation from that school indicating the CIP code for that program.
3/21 网申，当天刷卡，Case Was Received and A Receipt Notice Was Emailed
3/30 Card Is Being Produced!
4/1 Card Was Picked Up By The United States Postal Service
4/5 Card Was Delivered
祝每一位即将要申请OPT Extension / STEM OPT延期的同学申请顺利～早日拿到EAD卡！