Hello,

Please add this code to the Theme Settings > Custom CSS > Global:

body .wd-add-btn-replace .add-to-cart-loop:before{
content:"";
background-image:url( https://broadwayz.ae/wp-content/uploads/2020/09/Cart-Icon.png);
background-size:contain;
background-position:65% center;
background-repeat:no-repeat;
}

Best Regards