If you visit my page, it gives directions on how to install the script. If you can't find your scripts folder, open the text editor, navigate to the script file and open it. Once its selected, you can choose 'run script' and it will start going. The script is not part of Blender's normal script selection, you have to download it and install it into the scripts directory. Then you have to restart Blender and it should turn up under 'export'.
I was visiting your page because i wanted to install md3 exporter but i cant find any scripts folder, there is nothing like this in my blender folder and none of paths with blender in name has any scripts or py files. There are some py files in a zip named python25 which is inside blender folder and in the python's folder itself but that's it. I don't know what to do:( I have vista
Edit: When i created this path myself and copied it there then it shows up, but all the other import/export options disappear:(