localhost/web server mac os x 10.6.8

I've downloaded a website template that I previously hosted on ArcGIS online because I want to customize it further. From what I've read on the internet, it sounds like I can test my customizations through localhost.

I can get to localhost. It says it works, but when i insert index.html, the .zip, or the unzipped, it doesn't look (uturn.co.nz).

The only part of index.html I've amended is appid="64f4a989a44445fe85788a6a27282ece" on line 47, so I think that's where the problem is, or maybe my file structure?

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I am able to get to my localhost. It always comes up with "It works!" When I try to load the attached folder, it doesn't work.

I get to my localhost and then I click on the folder and unzip it. It needs to be zipped initially correct? When I load the folder unzipped, I can't see it in the localhost. Then, I click on index.html in the downloads area and get the following error message. "Application loading failed. The application has to be accessed through a web server. Consult user guide.

I've also tried just just putting index.html in my sites folder. All the mac tutorials I read say to do this, but then I get this image when I try to go through my localhost.

Would you be able to provide further clarification on the following as well?

1. Is local host a web server?

2. Local host and web server are already activated on Mac OS X 10.6.8, and there aren't further steps I need to take like for other later systems?

I appreciate any advice you have. I am completely new to servers.

This is the code.