Is it possible to change this color?

How can I change the gray or red color? The only one I can change is the green color.
Files:
Double click them
Manuel Alejandro Cercos Perez #:
Double click them

Thanks but I tried that and it only changes the green one.

C.D.M :
How can I change the gray or red color? The only one I can change is the green color .

It's simple:


Vladimir Karputov #:

It's simple:


Easy as pie. ;)