How to Hide the "Bibcit Any2HTML" Admin Menu

function plt_hide_bibcit_any2html_menus() {
	//Hide the "Settings → Bibcit Any2HTML" menu.
	remove_submenu_page('options-general.php', 'any2html');
}

add_action('admin_menu', 'plt_hide_bibcit_any2html_menus', 11);

Where do I put this code?