Extending your stay without leaving the country. First, fill out and sign the back of the white page of your new Form IAP-66. Then proceed either by notification or by application . Notification is more convenient. That will complete your extension.
Application is much less convenient.
Disregard the first paragraph of that section, which tells you to mail J extensions to your local INS office. That practice has been changed since Form I-539 was last revised. Send the application via some kind of secure mail that will give you a receipt. The least expensive, and slowest, is certified mail, with return receipt requested. If your application for extension of stay reaches INS by the expiration date on your I-94 Departure Record card, you may legally continue any authorized employment for up to eight months while the application is pending.