To add a new slider item, search for the main-slideshow block and copy/paste a list item.
<li> <article class=" vertical-middle-block l-ac "> <div class="table-row-block"> <div class="table-cell-block" style="color: #ffffff;"> <header> <h3 class="slide-title"> Slider title </h3> </header> <p class="slide-description"> Slider description </p> </div> </div> </article> <!-- Slider image --> <img src="img/slideshow/1.jpg" alt="slide" /> </li>