In the "Remote Info" or "Web Server Info" section, you would want to set the following parameters:
FTP Host: your_domain.com
Host Directory: www/
(Replace your_domain.com with the name of your website, your_username with the username for your account, and your_password with the password for your account. )
Note that if you have not transferred your domain name over to our nameservers yet, and wish to work on your account to get things setup, you can enter the IP address number or temporary domain name we provided you with in the setup email as the "FTP Host".