If you want to customize your LN skin:
Go to skin folder -> skin.fig -> [mania] -> //image -> copy and paste your desired LN folder name to "Noteimage0L" like picture below -> done
My LN folder named "LNTail7" so i copy and paste the folder name to the skin.fig just like the picture above
Noteimage0L is for LN on the far left of the column, noteimage1L is right after it and so on..
Hope this will help