Default to logged-in user name

Fixed it. It appears that the user nickname is referenced in simple-ajax-chat-form.php but not defined anywhere.

Here my solution if somebody needs it:
Edit simple-ajay-chat-form.php at line 80:

<?php get_currentuserinfo();
       echo $custom_form_pre; ?>

to:

<?php global $current_user;
       get_currentuserinfo();
       $user_nickname = $current_user->display_name;
       echo $custom_form_pre; ?>

Done.

thanks i wanted this ??