Thanks for posting your question. You need to configure Dreamweaver to publish specifically to the add-on domain. You can follow the following tutorial to do so, however you will need to change some of the settings:
Server Name: Enter a name for this server
Connect using: Choose FTP
FTP Address: Enter your primary domain name here
Username and Password: Enter your cPanel username and password
Root Directory: /public_html/youraddondomain.com (replace this with the root folder you set up for the add-on domain)
Web URL: This will auto fill in for you when you enter a root directory. Please be sure to remove "public_html" from the Web URL so that it only reads http://yourdomain.com
More Options - Use Passive FTP: Select "Use Passive FTP"
I hope this helps! Let me know if you need further assistance. Thanks!
Thank you for your help...it really helped...the problem I now have is that in order to get to it, I have to type the add on domain first then the main domain... I thought it would just be the add on domain as one url.