Tips on Customizing IMPress Listings

How to Hide IMPress Listings Admin Menus

function plt_hide_wp_listings_menus() {
	//Hide "Listings".
	remove_menu_page('edit.php?post_type=listing');
	//Hide "Listings → Listings".
	remove_submenu_page('edit.php?post_type=listing', 'edit.php?post_type=listing');
	//Hide "Listings → Add New Listing".
	remove_submenu_page('edit.php?post_type=listing', 'post-new.php?post_type=listing');
	//Hide "Listings → Status".
	remove_submenu_page('edit.php?post_type=listing', 'edit-tags.php?taxonomy=status&post_type=listing');
	//Hide "Listings → Locations".
	remove_submenu_page('edit.php?post_type=listing', 'edit-tags.php?taxonomy=locations&post_type=listing');
	//Hide "Listings → Property Types".
	remove_submenu_page('edit.php?post_type=listing', 'edit-tags.php?taxonomy=property-types&post_type=listing');
	//Hide "Listings → Features".
	remove_submenu_page('edit.php?post_type=listing', 'edit-tags.php?taxonomy=features&post_type=listing');
	//Hide "Listings → Import IDX Listings".
	remove_submenu_page('edit.php?post_type=listing', 'wplistings-idx-listing');
	//Hide "Listings → Settings".
	remove_submenu_page('edit.php?post_type=listing', 'wp-listings-settings');
	//Hide "Listings → Register Taxonomies".
	remove_submenu_page('edit.php?post_type=listing', 'register-taxonomies');
	//Hide "Listings → Reorder Taxonomies".
	remove_submenu_page('edit.php?post_type=listing', 'reorder-taxonomies');
}

add_action('admin_menu', 'plt_hide_wp_listings_menus', 16);

Where do I put this code?

How to Hide IMPress Listings Meta Boxes

function plt_hide_wp_listings_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Property Details" meta box.
	remove_meta_box('listing_details_metabox', $screen->id, 'normal');
	//Hide the "Additional Details" meta box.
	remove_meta_box('listing_features_metabox', $screen->id, 'normal');
	//Hide the "Listing Template" meta box.
	remove_meta_box('wplistings_listing_templates', $screen->id, 'side');
	//Hide the "IDX Broker" meta box.
	remove_meta_box('idx_metabox', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_wp_listings_metaboxes', 20);