Woocommerce Single Product Gallery Slider

I used to be in a position to create a slider for the principle picture however how can I create a slider for the thumbnails and never the thumbnails? I do not know what to do about it

Thanks upfront

Hyperlink to Single Product Web page

features.php

operate cuswoo_update_woo_flexslider_options( $choices ) {

    $choices['directionNav'] = true;

    return $choices;
}

CSS

ul.flex-direction-nav {
    place: absolute;
    high: 30%;
    z-index: 99999;
    width: 100%;
    left: 0;
    margin: 0;
    padding: 0px;
    list-style: none;}

li.flex-nav-prev {float: left;}
li.flex-nav-next {float: proper;}
a.flex-prev {visibility:hidden;}

a.flex-next::after {
    visibility:seen;content material: 'f054';
    font-family: 'Font Superior 5 Free';
    margin-right: 10px;
    font-size: 20px;   
    font-weight: daring;
}
a.flex-prev::earlier than {
    visibility:seen;
    content material: 'f053';
    font-family: 'Font Superior 5 Free';   
    margin-left: 10px;
    font-size: 20px;
    font-weight: daring;
}