write Search.. in search box

how can i writ Search... in this search box like this

You can use one of the following scripts in all the pages.

Option 1 :
Uses an older placeholder method.

Code:

$(function() {
  $(function() {
    var fa_textarea = document.getElementById('fa_textarea');

    if (fa_textarea) {
      window.fa_textarea_placeholder = 'Search...';

      fa_textarea.value = fa_textarea_placeholder;

      fa_textarea.onfocus = function() {
        if (this.value == fa_textarea_placeholder) {
          this.value = '';
        }
      };

      fa_textarea.onblur = function() {
        if (!this.value) {
          this.value = fa_textarea_placeholder;
        }
      };

    }
  });
});

Option 2 :
Uses the placeholder attribute.

Code:

$(function() {
  $(function() {
    var fa_textarea = document.getElementById('fa_textarea');

    if (fa_textarea) {

      fa_textarea.placeholder = 'Search...';

    }
  });
});

i tried this but does not work:(

I reviewed the scripts and there's no reason they shouldn't work, which leads me to believe the problem is from a script installed on your end. Please provide the URL of the forum you're installing this on, so I may inspect your forum.