1. Download AmpJuke, extract the files in the "AmpJuke-x.x.x.tar.gz"-archive and - if you need to do so - use Filezilla or a simliar FTP-related program to transfer the contents to your webserver.
2. Open a browser and point it to:
http://www.your-server.com/ampjuke-directory/
3. Follow the onscreen instructions by entering the fields in the form.