Background Troubles.

Sorry, I’m a noob both to this forum and to skinning. Can someone please point me in the right direction as to where to find the fallback background setting in the xml files? I would like to set it as an image in the special://skin/backgrounds folder but cannot do so in kodi. Or alternatively I would just like to know where the xml setting is to change the default image that is the background with this pack. Thanks in advance!