Dashboard show posts by category

I use this code

add_filter( 'wpuf_dashboard_query', 'wpufe_dashboard_category' );
function wpufe_dashboard_category( $args ) {
 
    $args['category__in'] = 2;
  
    return $args;
}

Hi, thanks but where do I have to add this code? wpuf functions or to my templates functions?
There is a shortcode to do this job?

I am using this shortcode:
[wpuf_dashboard post_type=”post”]

is there a way to add the category id of the post I want the user to edit?

Thanks!!!