After implementation of this code I was able to see the generated on user profile via backend but now I want to echo on my site header so all members can see there registration number

/**
* Upon user registration, generate a random number and add this to the usermeta table
*
* @param required integer $user_id The ID of the newly registerd user
*/
add_action(‘user_register’, ‘my_on_user_register’);
function my_on_user_register($user_id){

$args = array(
‘length’ => 6,
‘before’ => date(“Y”)
);
$random_number = my_random_string($args);
update_user_meta($user_id, ‘random_number’, $random_number);

}

/**
* Output additional data to the users profile page
*
* @param WP_User $user Object properties for the current user that is being displayed
*/
add_action(‘show_user_profile’, ‘my_extra_user_profile_fields’);
add_action(‘edit_user_profile’, ‘my_extra_user_profile_fields’);
function my_extra_user_profile_fields($user){

$random_number = get_the_author_meta(‘random_number’, $user->ID);
?>
<h3><?php _e(‘Custom Properties’); ?></h3>

<table class=”form-table”>
<tr>
<th><label for=”address”><?php _e(‘Random Number’); ?></label></th>
<td><?php echo $random_number; ?></td>
</tr>
</table>
<?php
}