I don't know how to use the dang AOKMPS thingy either. But installing a mod is easy. Just download the mod, unzip in your C:\Program Files\Microsoft Games\Age of Empires II folder, click on the mod's icon, and soon it should install (some modmakers add instructions along with their mods in some occasions).
There, are you helped?
TREXMAN
Species: Tyrannosaurus Rex
Diet: Annoying forumers
TREXMAN...King of the Jungle...so you better watch out!