To do this you should write your custom handler for the logout event.  So you need to write a simple plugin like this:

<?php
    /**
    * Logout Redirector
    *
    */
   
function logout_redirector_init() {
        elgg_register_event_handler('logout','user','logout_redirector_handler');
}

function logout_redirector_handler($event, $type, $entity)    {

    // Redirect the user to wherever you want
    forward(elgg_get_site_url() . 'your about page'); 
}

elgg_register_event_handler('init', 'system', 'logout_redirector_init');
?>

 

sory am very new in elgg can you please cleare it where i write  the plugin..

@sharon - read up on the structure of a plugin - all you need for this is the manifest and what elggcloud posted as the start.php

Documentation: docs.elgg.org

Also, please just post your question once.

No problem, it is really easy to create plugins for Elgg, and such a logout redirector plugin will be a very small one.

First of all, you should start with reading this documentation:

http://docs.elgg.org/wiki/Plugin_development

And, here is a short guidance:

1. You create a subdirectory called logout-redirector under /mod folder. Every Elgg plugin sits in a subdirectory of the /mod folder.
   
   
2. Create a the file start.php under /mod/logout-redirector subdirectory.
   
   
3. Copy and paste the code I posted in start.php
   
   
4. Create the plugin manifest file manifest.xml under /mod/logout-redirecto subdirectory. You can see so many examples of manifest files in Elgg community plugins in order to create your own. It is just a simple xml file to edit.
   
   
5. Activate your plugin in your Elgg admin site.