HTML itself doesn't have the capabilities to allow your visitors to send you an email except for the email link which uses their own default email program to pop up a blank email with your name in it. They would then fill it out and send it to you. This email link can be easily inserted with Dreamweaver- it's the envelope icon.
If you're talking about a customized form where people fill out customized fields, you will need some sort of actual program written in a progamming language (like PHP, CGI, whatever) which would be the "action" of the HTML form.
PHP provides a simple mail function that can do this, it just needs some customization. You can read about it by going to the PHP manual - [man]mail[/man]. Save that code in a .php file and make your "action" point to the file.
Hope that helps-
-Elizabeth