Where do i save the skins?

In my lfs documents i have a few skin folders

Skins (This is a word file)
Skins_X
Skins_Y
Skins_dds

Hey Guys. Sorry if this is in the wrong section.

Basically all i want to know is where can i get new skins for my car and how do i put them onto my game and use them in the race?

I'm only on the demo and i want a new skin for the FBM and the XF GTI.