---unzip everything into your skyrim install directory.
This defaults to your steam/steamapps/common/skyrim folder.
If you don't know where you installed Steam to, chances are it's on your C drive.
That'd make it C:Program Files (x86)steamsteamappscommonskyrim
I mean, if this is your first installed mod, you might not know that sort of thing.


TO REMOVE THIS MOD:
delete "dbarmor" from both the /meshes/ and /textures/ directories within your skyrim data folder. There's no .esp or anything, it's just a straight swap.
Deleting these files will roll everything back to reading from the vanilla .bsa files, so don't worry! It'll all be red again.