Fill these out. DO NOT include any extra information. I know some of you will be worried about the "Experience" section, but don't sweat it, especially if you're young. I suggest putting down anything school talent show and larger down. (The backyard show you put on with the neighbor kids doesn't count...)
If you haven't taken any lesson, don't mention it! The judges assume you have had no lessons or training unless you mention a school or time when you did receive it.
Area of Application - It means, "What Are You Auditioning For?". In other words, singer, dancer, VJ, actor, model, etc.
Hit send.
If your files won't all fit, DO NOT send multiple e-mails. Trim the length of your singing and/or dancing clip. In all honestly they probably won't watch more than 30 seconds anyway. Also, double check that you can play the files without any problems. If there are any glitches or errors, they will disregard your e-mail.
Another suggestion is to send the e-mail on weekdays. The weekends are probably a very busy time.
If you do not receive a reply with 2-4 weeks, assume that you did not qualify. SM's official website and their official Facebook page state that "E-mail audition results will be notified individually to only those who were qualified."