But which is the skin file for MP2, I have read the wiki but am still a little confused.
If you have compiled MP2 take a look into ROOT/Plugins/SkinBase/ => Skin/default
there you will find the .xaml files and these you can modify as you like
Edit:
Okay there are some more possibilities but this should be enough for the beginning =)
Some more information in the Wiki:
Skin Design - MediaPortal Wiki
Skin Engine - MediaPortal Wiki
- Layout system - MediaPortal Wiki
- Management of UIElements and resources - MediaPortal Wiki