installing PHPBB website address double=404 page not found

Hello
I am using the latest zen cart. My web site is "shop.nilandsplace.com/radio/" I am using the apple zen template.
I am having problems getting the config file to have the PHPBB go to the right directory what sould be "help.nilandsplace.com/radio" If I put the adress ```
define('DIR_WS_PHPBB', '/home/www/help.nilandsplace.com/radio/');

What am I doing wrong? I have looked at other threads (what few they are) and have come to this point.
Thanks

Also if I don't use the previous address mentioned the forum link goes away. I have tried //help.nilandsplace.com/radio/ but this won.t work and I lose the link.

While no one was helping me I copied the PHPBB files into the zen cart sub directory I created > //shop.nilandsplace.com/radio/radiohelp/ and set my configure.php to ```
define('DIR_WS_PHPBB', 'radiohelp/');