1. Locate http.conf, and open in an editor
   Likely location /etc/apache2/

2. Uncomment the following line (remove #), and save
   #LoadModule php5_module libexec/apache2/libphp5.so

3. Locate DocumentRoot
   Scroll down a bit, should be something like (might be a different path?):
   DocumentRoot "/Library/WebServer/Documents"

4. Navigate to the Document Root, and create a new folder there (e.g. chat)

5. Dump the contents of chat.zip there

6. Start apache
   in a terminal: sudo apachectl start

7. In safari, navigate to http://localhost/chat/chat.htm