HELP: Add new parameters to users?

Update: tried the following:

<label><?php _e('Functions:') ?>
<input type="text" name="func" id="func" value="<?php echo $profileuser->user_func ?>" /></label>

(in wp-admin/profile.php)

I guess the new value of User Function will be saved as user_func, right? The Profile area shows the new textbox nicely, but when I hit “Update”, the textbox goes blank so I guess my newly defined value is not being saved.
1. What do I have to do to make the system save the new function as user_func?
2. What code do I have to implement in the sidebar to include the User’s Function (aka user_func)?

Please help!! Thanks

Here’s a little plugin I wrote for my own purpose. It saves the flickr profile url in user option. You may clean it and use it for what you want to do.

File: ptFlickR.php

<?php
/*
Plugin Name: ptFlickR
Plugin URI: https://www.alakhnor.com/post-thumb
Description: Adds FlickR profile url to user profile screen.
Version: 1.0
Author:  Alakhnor
Author URI: https://www.alakhnor.com/post-thumb

	Copyright (c) 2007 Alakhnor (https://www.alakhnor.com/post-thumb) for ptFlickR
	ptFlickR is released under the GNU General Public License (GPL)
	https://www.gnu.org/licenses/gpl.txt

	This is a WordPress 2 plugin (https://www.remarpro.com).
*/

// Defines path & urls
define('PTF_BASENAME', dirname(plugin_basename(__FILE__)));
define('PTF_ABSPATH', ABSPATH.'wp-content/plugins/' . PTF_BASENAME.'/');

// calls function & class files
require(PTF_ABSPATH . 'ptFlickR-admin.php');

?>

File: ptFlickR-admin.php

<?php
$PTFlickRAdmin = new pta_author_flickr_admin();
class pta_author_flickr_admin {

	/************************************************************
	/*	constructor
	************************************************************/
	function pta_author_flickr_admin() {

                $this->init();

	}
	/************************************************************
	/*	init()
	************************************************************/
	function init() {

		add_action('edit_user_profile', array(&$this, 'display_flickr'));
		add_action('show_user_profile', array(&$this, 'display_flickr'));
		add_action('profile_update', array(&$this, 'save_flickr'));
	}
	/************************************************************
	/*	display_flickr()
	************************************************************/
	function display_flickr() {

		$author_id = $GLOBALS['profileuser']->user_login;
		$flickr_url = trailingslashit(get_user_option('flickrurl'));

		// Input form
		?>
		<fieldset>
			<legend><?php _e('Additional informations'); ?></legend>
			<label><?php _e('FlickR profile:'); ?></label>
			<input type="text" style="font-size: 1.2em;" name="flickrurl" value="<?php echo $flickr_url; ?>" />

		</fieldset>
		<?php
	}
	/************************************************************
	/*	save_flickr()
	************************************************************/
	function save_flickr($user_ID) {

		if (isset($_POST['flickrurl'])) {
			$flickrprofile = $this->return_profile($_POST['flickrurl']);
			update_user_option($user_ID, 'flickrurl', $_POST['flickrurl']);
			update_user_option($user_ID, 'flickrprofile', $flickrprofile);
		}

		return $user_ID;
	}
	/************************************************************
	/*	return_profile()
	************************************************************/
	function return_profile($flickrurl) {
		return $flickrurl;
	}

} // flickr_admin
?>

Thank you for your help, but; considering I’m a real php newbie, you need to tell me how to use it for my purpose before it’s of any use to me ??
Did you understand what results I want to have? If yes, could you please alter the code and post it and tell me where I have to put those files in or if I have to activate any plugins etc?

Thank you VERY much! ??

… please? ??