Sometimes the translation to ASCII can be difficult, with the result looking rather poor. Other times the ASCII version is fine. Generally speaking, complex tables do not translate very well, but straight text with no fancy formatting works best.
After you have saved the materials in ASCII, you should look over the result using some kind of text editor. The Windows Notepad program can read and write ASCII files. You might use this to possibly clean things up the way you might edit an outgoing email message.
Once you are satisfied with the appearance, you need to include the materials in your outgoing email. Depending on what browser you are using to read this, it might be possible to include the text file as an attachment when you click on our mailto URL: Syllabits@nsns.com.
If that does not work for you, use your regular PC or MAC based email program, and include your materials as an attachment.
If you use a host based email system, such as Pine or Elm or Profs, you need to transfer your materials from your desktop system to the host. Often times this is accomplished with a program called FTP, although your local situation may be different. Once the syllabus is on the host, include it in the outgoing message. If you use the Pico editor, this is done with control-r. If you use Elm, you can invoke Elm with the -i command to include a file. Your local situation might be different, but the basic idea of including your materials in an ongoing email letter will be the same regardless of local conditions.
I suspect there will be two possibilities. Either all of this will be immediately obvious, or it will be impossibly difficult. The odds are that there will be no in-between. You can feel free to follow up with a technical question if you get stuck by sending email to email@example.com.