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);