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Just terminology. Read server for computer. I assume you have mySQL and php running on your server. You need to download the package using the link already given. I unpacked it to my local hard drive, then uploaded the files to the server. They need to be in a classifieds folder at the site's root directory (e.g. public-html). Then run the installation script by accessing it with a browser, as described in their install directions. It's pretty straight forward.
My installation is behind a member only password protected directory. If the installation that you have seen (ie bicycles) isn't enough, let me know by PM and I'll give you temporary access to my installation.
Barry