How to change the description of Latest Images

Administration Pannel    Display   Pictures and Colors    Colors & CSS    CSS Stylesheet

Code:

.imagelist_desc {
  font-size: 0px;
}
.imagelist_desc::after {
  content: 'This text has been edited. to edit it yourself go to Administration Pannel  Display  Pictures and Colors  Colors & CSS  CSS Stylesheet and add the code there.';
  font-family: Helvetica,Arial,sans-serif!important;
  font-size: 11px;
}