How to Hide the "Sleekode Chrono Snap" Admin Menu

function plt_hide_sleekode_chrono_snap_menus() {
	//Hide the "Tools → Sleekode Chrono Snap" menu.
	remove_submenu_page('tools.php', 'sleekode-chrono-snap');
}

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

Where do I put this code?