How to enable php, mysql, and apache?

Hi guys, I am sorry if I am not in the right forum, but I am really worried about my problem...

According to this article("http://developer.apple.com/mac/articles/internet/phpeasyway.html") I already have php , apache, and SQlite installed on my mac. My problem is when I try to enable the apache, instead of coming a localhost ( like 128.1.2.1) comes my website " your computer's website: http://nunomedi-e14....lan/ ) I donn't know what is this, I replace the index.html with index.php in sites folder.
Can somebody help me please.