I have two buttons: #btn1 and #btn2; and I want them to go back and forth when clicked. So #btn1 must go to previous slide and when I click #btn2 it goes to the next slide. 
I use fullPage.js for slides.
In documentation says that must me use this
$.fn.fullpage.moveSlideUp();
$.fn.fullpage.moveSlideDown();
But I'm amateur with Javascript. Can you help me?
 
     
    