I have a Dune HD Smart B1 and am running the latest firmware-

Can anyone tell me how (step by step) on how to easily import custom graphics to do a custom skin. I am wanting to do movie cover art and music cover art along with changing the background to a custom graphic. I am very good at designing my own custom graphics or altering others via Gimp Shop. I just need to know how to get them into the Dune to replace the factory GUI. I am reading all my movies and music off of a Toshiba 2TB drive. I have tried to make sense out of the Dune web support page talking about how to do this, but I am confused. Help!!!