Hi Daiber,
Unzip the zip file, in a directory other than Program Files (x86), (due to windows 7 copy protections). Copy the _Voronoi.htm and .js files to your moi3 commands folder. The path will be similar to C:\Program Files (x86)\MoI 3.0\commands.
Then, open MoI, and set up a shortcut, under Options / Shortcut keys. Chose a Key, and enter the command as _Voronoi.

Brian