Open it for editing. This is an administrator owned file
On MacOSX BBEdit is a great editor and is highly recommended. You can download a demo
and try it for free. It is a GUI editor that can edit Admin owned files
Otherwise - sudo pico httpd.conf
Enable PHP - Skip these steps if you have done this already
Lines starting with a # are comments or commands commented out
Search for php
Enable LoadModule php4_module
Search again
Enable AddModule mod_php4.c
Drop to the bottom of the file (You can insert these lines elsewhere if you prefer)
Add: addtype application/x-httpd-php .php
Add to Bottom of file alias to for the physical location of your music
Alias /Music/ "/SomePath/SomePlace/BlahBlah/"
As an alternative to the Alias, you can use a symbolic link in your YoDJ directory.
If you understand what this means, you know what to do