urgent for deadline – caption slide in

hi, i am trying to edit the source code to have the caption slide in on load. but im not getting anywhere in terms of where to actaully put the code.

$('#metaslider_8').responsiveSlides({
                timeout:3000,
                pager:true,
                nav:true,
                pause:true,
                speed:600,
                prevText:"<",
                nextText:">",
                auto:true,
                before: function() {
                    $('.caption-wrap').hide();
                },
                after: function() {
                    $('.caption-wrap').show().css("width", "0").animate({ width : "20%" });
                }
            });

https://wordpress.org/plugins/ml-slider/