(Solved) Help. How to edit the counter cutout.

Hello. I am working on a counter top grill that goes inside a counter. Im having problems to edit the alpha image of the cutout because i dont know where to edit. Any help. or provide a image to where edit the areas. Its the same cutout that uses the sinks, but dont know where to edit them. 

Here its the package

www.mediafire.com/download/r5ivoqg1ivxy09o/necrodog-counter-fridge-prue-grill.package

Here its the default image to edit.



Thanks in advance.