Tips on Customizing Asset CleanUp: Page Speed Booster

How to Hide Asset CleanUp: Page Speed Booster Admin Menus

function plt_hide_wp_asset_clean_up_menus() {
	//Hide "Settings → Asset CleanUp".
	remove_submenu_page('options-general.php', 'http://127.0.0.1/wp-admin/admin.php?page=wpassetcleanup_settings');

	//Hide "Asset CleanUp".
	remove_menu_page('wpassetcleanup_getting_started');
	//Hide "Asset CleanUp → Getting Started".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_getting_started');
	//Hide "Asset CleanUp → Settings".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_settings');
	//Hide "Asset CleanUp → CSS/JS Manager".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_assets_manager');
	//Hide "Asset CleanUp → Plugins Manager".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_plugins_manager');
	//Hide "Asset CleanUp → Bulk Changes".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_bulk_unloads');
	//Hide "Asset CleanUp → Overview".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_overview');
	//Hide "Asset CleanUp → Tools".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_tools');
	//Hide "Asset CleanUp → License".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_license');
	//Hide "Asset CleanUp → Help".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_get_help');
	//Hide "Asset CleanUp → Go Pro".
	remove_submenu_page('wpassetcleanup_getting_started', 'wpassetcleanup_go_pro');
}

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

Where do I put this code?

How to Hide Asset CleanUp: Page Speed Booster Meta Boxes

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

	//Hide the "Asset CleanUp: Options" meta box.
	remove_meta_box('wpassetcleanup_page_options', $screen->id, 'side');
	//Hide the "Asset CleanUp: CSS  JavaScript Manager" meta box.
	remove_meta_box('wpassetcleanup_asset_list', $screen->id, 'normal');
}

add_action('add_meta_boxes', 'plt_hide_wp_asset_clean_up_metaboxes', 20);