The full system path to your hosting account's top folder (home directory) is:
/home/user_name
The system path to your main domain's directory is:
/home/user_name/www/www/
That is where you need to keep the files for your main www subdomain (the contents of your site http://www.your_domain.com).
The full system path to your private directory is:
/home/user_name/private/
You can learn more on your private directory and its usage in our Private directory article.
Note: You should change user_name with your actual username, e.g. /home/jane/www/www/.