title: Add next prev button on slick carousel
body: <p>Recently I have added <a href="https://github.com/kenwheeler/slick" rel="noreferrer">Slick carousel</a> on my project.</p>
  
  <p>Reading there document i have seen there is a method <code>slick Prev()</code> and <code>slick Next()</code>.</p>
  
  <p>But I am asking you how do I use this method.  I have try this long time but I actually I can't understand how to use this with <code>html button</code>.</p>
  
  <pre><code>$('button.next').click(function() {
      $(this).slickPrev();
  });
  </code></pre>
  
  <p>I have tried this way.</p>