Add custom buttons on Slick Carousel

I know this is an old question, but maybe I can be of help to someone, bc this also stumped me until I read the documentation a bit more:

prevArrow string (html|jQuery selector) | object (DOM node|jQuery object) Previous Allows you to select a node or customize the HTML for the "Previous" arrow.

nextArrow string (html|jQuery selector) | object (DOM node|jQuery object) Next Allows you to select a node or customize the HTML for the "Next" arrow.

this is how i changed my buttons.. worked perfectly.

  $('.carousel-content').slick({
      prevArrow:"<img class='a-left control-c prev slick-prev' src='../images/shoe_story/arrow-left.png'>",
      nextArrow:"<img class='a-right control-c next slick-next' src='../images/shoe_story/arrow-right.png'>"
  });

From the docs

prevArrow/nextArrow

Type: string (html|jQuery selector) | object (DOM node|jQuery object)

Some example code

$(document).ready(function(){
    $('.slick-carousel-1').slick({
        // @type {string} html
        nextArrow: '<button class="any-class-name-you-want-next">Next</button>',
        prevArrow: '<button class="any-class-name-you-want-previous">Previous</button>'
    });

    $('.slick-carousel-2').slick({
        // @type {string} jQuery Selector
        nextArrow: '.next',
        prevArrow: '.previous'
    });

    $('.slick-carousel-3').slick({
        // @type {object} DOM node
        nextArrow: document.getElementById('slick-next'),
        prevArrow: document.getElementById('slick-previous')
    });

    $('.slick-carousel-4').slick({
        // @type {object} jQuery Object
        nextArrow: $('.example-4 .next'),
        prevArrow: $('.example-4 .previous')
    });
});

A little note on styling

Once Slick knows about your new buttons, you can style them to your heart's content; looking at the above example, you could target them based on class name, id name or even element.

Did somebody say JSFiddle?