We use yootheme´s template with smooth scroll links for buttons.

How can I add the script so it works in the slider?

Trying to add:

jQuery(function($) {
// enable smooth scroll for main navigation
$('.tp-revslider-mainul').each(function(i, element) {
var obj = new $.UIkit["scrollspynav"](element, {smoothscroll: {closest: 'li', offset: 90}});
});
});