Function to Change Customize Admin Page Footer

/**
* code #16 - customize the admin page footer text
* source - http://wordpress.stackexchange.com/a/6005/8922
*/
function custom_admin_footer() {
echo 'add your custom footer text and html here';
}
add_filter('admin_footer_text', 'custom_admin_footer');

This isn’t a piece of the layout where many people think to look, but WordPress users love customizations. If you want to update some new links or text into your admin panel footer area, just copy over this block of code and edit the string value. Whatever is being output to the page will display in your admin footer text area.