I think what's not terribly obvious, unless you've installed MODs before, is that the .xml files within the MOD ARE the instructions. Until you know that, it looks like just a bunch of files, with no help.
Sjeng, just find ALL the .xml files within the MOD, and double click them to open them in your browser. You'll find step by step instructions inside.
I think maybe MODs could contain a 2 line README file with the above in it, for people who've never seen a mod before. I think there are supposed to be instructions on the main phpbb site, but of course, that's not available at present.

