Unable to Add/edit slide (Layer Slider)

Hi, first of all thanks for the theme, I love it. But I've a problem with the Layer Slider (dexp_layerslider); I can't edit or add any new slide. I saw the video you posted on YouTube but actually I don't have the "layer slider" voice inside the administration menu. I tried entering the url (mysiteurl/admin/dexp_layerslider/add) but with no luck. Thank in advice, Ilir