How can I change parallax background image

I want to change parallax background image, but can’t find anywhere can change these background image:
http://www.amazingunclessapa.com/wp-content/uploads/2017/02/banner-home3.jpg
http://www.amazingunclessapa.com/wp-content/uploads/2016/09/bg-popular.jpg
data-vc-parallax-image=”http://www.amazingunclessapa.com/wp-content/uploads/2016/09/bg-pallarax.jpg”
style=”background-image: url(http://www.amazingunclessapa.com/wp-content/uploads/2016/12/bg-newlleter.jpg)”