In admincp/index.php find:
THis
construct_nav_option($vbphrase['generate_mailing_list'], 'email.php?do=genlist', '<br />');
Under that add this:
construct_nav_option($vbphrase['pick_random'],'randomuser.php?', '<br />');
Upload the file randomuser.php to your admincp/ dir
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In admincp add a new phrase:
Varname - random_user
Text - Pick Random User
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All done!.
Enjoy
-Pheonix