How to Hide Auto Focus Keyword for SEO Admin Menus

function plt_hide_auto_focus_keyword_for_seo_menus() {
	//Hide "Auto Focus Keyword".
	remove_menu_page('auto-focus-keyword-for-seo');
	//Hide "Auto Focus Keyword → Auto Focus Keyword".
	remove_submenu_page('auto-focus-keyword-for-seo', 'auto-focus-keyword-for-seo');
	//Hide "Auto Focus Keyword → Contact Us".
	remove_submenu_page('auto-focus-keyword-for-seo', 'auto-focus-keyword-for-seo-contact');
	//Hide "Auto Focus Keyword → Upgrade".
	remove_submenu_page('auto-focus-keyword-for-seo', 'auto-focus-keyword-for-seo-pricing');
}

add_action('admin_menu', 'plt_hide_auto_focus_keyword_for_seo_menus', 1000000000);

Where do I put this code?