How to add third party plugin or code in wordpress like blogger -

i'am new wordpress , have used blogger presently want add third party code wordpress without using theme editor. , iam using example.wordpress.com.

i mean blogger adding widget mean html/javascript widget can add in wordpress iam confused add there no third party widget in wordpress dashboard how can add code. appreciable in advance.

<link rel="stylesheet" href="http://harvesthq.github.io/chosen/chosen.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js" type="text/javascript"></script> <script src="http://harvesthq.github.io/chosen/chosen.jquery.js" type="text/javascript"></script> <div>   <em>multiple select groups</em><br>   <select data-placeholder="your favorite football team" style="width:350px;" class="chosen-select" multiple tabindex="6">     <option value=""></option>     <option value="1" data-value="grapes+">grapes</option>   <option value="2" data-value="mango+">mango</option>    </select> </div>    <script type="text/javascript">  $(".chosen-select").chosen(); $(".chosen-select").bind('chosen:hiding_dropdown', function(e, i) {   searched_value = i.chosen.get_search_text();   firstelementondropdown = i.chosen.search_results.find('li.active-result').first()   if (firstelementondropdown.text().tolowercase() == searched_value.tolowercase()) {     firstelementondropdown.trigger('mouseup');     var t = i;     settimeout(function() {       t.chosen.input_blur();     }, 150);   } }); </script> 

go dashboard -> widgets -> drag , place text widget. paste in code there. work fine. no need of adding additional plugin. comes default