Layer slider not working

Hi, I´ve just set up and imported theme demo, but in Layer Slider Adm. panel, when I make clic over a slider, the page gets blank.
I went over the config-layerslider folder that comes with the theme and I found this, but I don´t understand very well what I should do.

– update layerslider.php file:
$GLOBALS[‘lsAutoUpdateBox’] = false;
define(‘LS_ROOT_URL’, get_template_directory_uri() . ‘/config-layerslider/LayerSlider’ );

– copy both sample folders to new layerslider folder
– remove all skins but “fullwidth” and “noskin” and “preview” from the new layerslider static/skins folder

thanks