How to Hide the "Simple Keyword To Link" Admin Menu

function plt_hide_simple_keyword_to_link_menus() {
	//Hide the "Simple Keyword To Link" menu.
	remove_menu_page('simple-keyword-to-link-words');
}

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

Where do I put this code?