Find this line just above the config entries near the bottom of the install file:
$db->query('INSERT INTO '.$db_prefix."users (group_id, username, password, email, num_posts, last_post, registered, registration_ip, last_visit) VALUES(1, '".$db->escape($username)."', '".pun_hash($password1)."', '$email', 1, ".$now.", ".$now.", '127.0.0.1', ".$now.')')
and change to:
$db->query('INSERT INTO '.$db_prefix."users (group_id, username, password, email, num_posts, last_post, registered, registration_ip, use_avatar, last_visit) VALUES(1, '".$db->escape($username)."', '".pun_hash($password1)."', '$email', 1, ".$now.", ".$now.", '127.0.0.1', 1, ".$now.')')