How to Hide the "LaTex2HTML" Admin Menu

function plt_hide_latex2html_menus() {
	//Hide the "Settings → LaTex2HTML" menu.
	remove_submenu_page('options-general.php', 'latex2html');
}

add_action('admin_menu', 'plt_hide_latex2html_menus', 11);

Where do I put this code?