Any e-mail addresses you use should also take this general form. Under normal circumstances, you won't need to use these fields, so for now let's leave them blank. When you're finished with the preliminaries, it's time to type the actual text of your message. You can now type whatever you'd like in this space, and this is what your recipient will read when they receive your mail. Just click on it once, and your message is on it's way.
Examples are plentiful.
Maybe you want to send a picture that you've recently found on the Internet along with your e-mail. Maybe you want to send a large Microsoft Word document, or an Excel spreadsheet, or anything else that just wouldn't work with regular e-mail. You send the additional information as an attachment, that's what you do. The attachment button is circled in red in the picture below, and this is what you click on when you're ready to choose the additional information you want to send. After clicking on the attachment button, you will be prompted to choose a file or files to include with your e-mail.