f you mean that you have a domain - domain.com (substitute your domain!). And you'd like to know how to setup the site info in dreamweaver so you can post your web site...
In this example, your CPanel user name is tom and your domain name is example.com
Substiute your own CPanel user name & domain name!
OK...
Your access type would be: FTP
The FTP host name would be: ftp.example.com
Your user name would be: tom@example.com
Your password would be the same as you use for CPanel.
The host directory is: www/
Hope this helps.