How to Hide WP Google Map Plugin Admin Menus

function plt_hide_wp_google_map_plugin_menus() {
	//Hide "WP Google Maps".
	remove_menu_page('wpgmp_view_overview');
	//Hide "WP Google Maps → WP Google Maps".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_view_overview');
	//Hide "WP Google Maps → How to Use".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_how_overview');
	//Hide "WP Google Maps → Add Location".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_form_location');
	//Hide "WP Google Maps → Manage Locations".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_manage_location');
	//Hide "WP Google Maps → Add Map".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_form_map');
	//Hide "WP Google Maps → Manage Maps".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_manage_map');
	//Hide "WP Google Maps → Add Marker Category".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_form_group_map');
	//Hide "WP Google Maps → Marker Categories".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_manage_group_map');
	//Hide "WP Google Maps → Plugin Settings".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_manage_settings');
	//Hide "WP Google Maps → Plugin Add-Ons".
	remove_submenu_page('wpgmp_view_overview', 'wpgmp_manage_extentions');
}

add_action('admin_menu', 'plt_hide_wp_google_map_plugin_menus', 11);

Where do I put this code?