Tips on Customizing QuadLayers TikTok Feed

How to Hide TikTok Feed Admin Menus

function plt_hide_wp_tiktok_feed_menus() {
	//Hide "TikTok Feed".
	remove_menu_page('qlttf_backend');
	//Hide "TikTok Feed → Welcome".
	remove_submenu_page('qlttf_backend', 'qlttf_backend');
	//Hide "TikTok Feed → Accounts".
	remove_submenu_page('qlttf_backend', 'qlttf_backend&tab=accounts');
	//Hide "TikTok Feed → Feeds".
	remove_submenu_page('qlttf_backend', 'qlttf_backend&tab=feeds');
	//Hide "TikTok Feed → Settings".
	remove_submenu_page('qlttf_backend', 'qlttf_backend&tab=settings');
	//Hide "TikTok Feed → Premium".
	remove_submenu_page('qlttf_backend', 'qlttf_backend&tab=premium');
}

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

Where do I put this code?

How to Hide the "QuadLayers News" Dashboard Widget

function plt_hide_wp_tiktok_feed_dashboard_widgets() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Remove the "QuadLayers News" widget.
	remove_meta_box('wp-dashboard-widget-news', 'dashboard', 'normal');
}

add_action('wp_dashboard_setup', 'plt_hide_wp_tiktok_feed_dashboard_widgets', 20);