How do I change the slug "autos" for another one?

Hi

Please install the theme child and uncomment the code , specify the desired name .

<?php
/************* LOAD REQUIRED SCRIPTS AND STYLES *************/
function pixchild_loadCss(){
		wp_enqueue_style('style', get_stylesheet_uri() );
}
add_action('wp_enqueue_scripts', 'pixchild_loadCss'); //Load All Css

add_filter( 'register_post_type_args', 'rename_post_type_slug', 10, 2 );
function rename_post_type_slug( $args, $post_type ) {

    if ( 'pixad-autos' === $post_type ) {
        $args['rewrite']['slug'] = 'auto';  // <-- RENAME HERE
    }
    return $args;
}

Thanks