How to Hide the "Text Hover" Admin Menu

function plt_hide_text_hover_menus() {
	//Hide the "Settings → Text Hover" menu.
	remove_submenu_page('options-general.php', 'text-hover/text-hover.php');
}

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

Where do I put this code?