gec100

open Admin panel -> Apearance -> Editor and find this section:

.icon-off:before {
  content: "\f021”;
}

and replace it with

.icon-off:before {
  content:url(library/images/your_icon_file.here);
}

The Power-Off icon can be removed or changed in the style.css under

.icon-off:before {

here is how i’ve done it:

.icon-off:before {
  /*content: "\f021”;*/
  content:url(library/images/g-logo.png);