Hi Sakib,

Thank you for contacting WPClever Support Forum. 

We’ve received your ticket and assigned one of our developers to help you with that. 

He’ll be looking into your question and responding with specific instructions as soon as possible. 

Please stay patient as we're having very heavy workloads, it might take some time for our developers to reach back.

Best regards.

Hi Sakib,

Please add below function to current-theme (or child-theme) / functions.php

add_filter( 'wooco_option_none_img_src', 'wooco_change_option_none_img', 99 );
add_filter( 'wooco_option_none_img_full', 'wooco_change_option_none_img', 99 );
function wooco_change_option_none_img( $img ) {
    return 'new-image-link.jpg';
}