How to Hide Citizens Feedbacks Admin Menus

function plt_hide_citizens_feedbacks_menus() {
	//Hide the "Citizens Feedbacks" menu.
	remove_menu_page('edit-cfeedbacks');
	//Hide the "Citizens Feedbacks → Citizens Feedbacks" menu.
	remove_submenu_page('edit-cfeedbacks', 'edit-cfeedbacks');
	//Hide the "Citizens Feedbacks → About plugin" menu.
	remove_submenu_page('edit-cfeedbacks', 'plugin_info');
}

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

Where do I put this code?