如何通过以下调用调用JavaScript函数来自动播放幻灯片？

I have a slider having three slides and its a four boxes slideshow. It breaks the 1st image into four and then the next image comes up. On the click of the next button the current image breaks up and the next image comes up. it works fine on click but i would like to automate this transition of the images. I tried using setInterval function of javascript but it didn,t work fine. I have this code from codrops and i am trying to integrate the same in my website. Please help me as I am new to jquery. I also saw a similar post but it didn't work. Following are the codes of HTML and js file.I have a slider having three slides and its a f