Hi,
I just installed the plex black skin on rasplex and wanted to give some indication on the way to set up a skin under rasplex (quite simple actually but easier to do if it is explained)
- unrar the downloaded skin on your computer
- download and install WINSCP
- using WINSCP, login to rasplex (user "root", password "rasplex")
- navigate to /storage/.plexht/addons
- upload the complete unrared directory to this location
- reboot rasplex
done...