To install Kiddac's skins or any other skin from the image's plugin server, follow the instructions
Menu > Plugins > Green (download plugins)
Select Skin packages
Press OK to expand the list
Scroll down to the Kidac skins
Select the ones you want. Press OK on them so that the they have a download indicator next to the them
Once you have selected the packages you want, press Green to install them.
After installation, the skin has to be selected/activated
Menu > Setup > Usage & GUI > Skin Settings > A list of installed skins is shown > Select/Highlight the one you want to activate > Press OK
Say yes to the restart option
