Option 1 In a FTP client enter this information. Host = add on domain name User = addondomain@primarydomain.com Password = what you entered during Addon domain creation Port = 21 Once you have successfully connected to your ftp client will be in the root of the add on domain name. If everything was successful you should see a folder called cgi-bin. Upload your files. Enjoy your new site. Option 2 In a FTP client enter this information. Host = primary domain name User = cPanel username Password = cPanel password Port = 21 Once you have successfully connected to your ftp client will be in the home directory. Double click the public_html folder. Double click the addon domain folder. Upload your files. Enjoy your new site.