How to Hide the "Free SEO Tools" Admin Menu

function plt_hide_bitoony_free_seo_checker_tools_menus() {
	//Hide the "Free SEO Tools" menu.
	remove_menu_page('menumain_seotools');
}

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

Where do I put this code?