Tips on Customizing Mapster WP Maps

How to Hide Mapster WP Maps Admin Menus

function plt_hide_mapster_wp_maps_menus() {
	//Hide "Maps".
	remove_menu_page('edit.php?post_type=mapster-wp-map');
	//Hide "Maps → Maps".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit.php?post_type=mapster-wp-map');
	//Hide "Maps → Add New Map".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'post-new.php?post_type=mapster-wp-map');
	//Hide "Maps → Map Categories".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit-tags.php?taxonomy=wp-map-category&post_type=mapster-wp-map');
	//Hide "Maps → Locations".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit.php?post_type=mapster-wp-location');
	//Hide "Maps → Lines".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit.php?post_type=mapster-wp-line');
	//Hide "Maps → Polygons".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit.php?post_type=mapster-wp-polygon');
	//Hide "Maps → Popup Templates".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit.php?post_type=mapster-wp-popup');
	//Hide "Maps → Categories".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'edit-tags.php?taxonomy=wp-map-category&post_type=mapster-wp-map');
	//Hide "Maps → Settings".
	remove_submenu_page('edit.php?post_type=mapster-wp-map', 'wordpress-maps-settings');
}

add_action('admin_menu', 'plt_hide_mapster_wp_maps_menus', 1000000000);

Where do I put this code?

How to Hide the "Map Preview" Meta Box

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

	//Hide the "Map Preview" meta box.
	remove_meta_box('mapster-wp-maps-preview', $screen->id, 'normal');
}

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