Fatal error: Call to undefined function bb_get_option() in /home/sites/wordpress/web/wp-content/plugins/php4bb/project-honey-pot-for-bbpress.php on line 27

Can I not use this plugin? I sure need something or I'll have to delete the forum.
Thank you

I think the problem you encountered is ALMOST EXACTLY the same as I experienced. This is the solution I applied to get the code working - please bear in mind, I was using two separate hosts, however you can use my solution as a guide.

First of all, ensure your subscribe table exists on the same installation as your forum.

Find function "stt_notify", I've modified it to be like

function stt_notify($post_id = 0) {
//remove_action('bb_new_post', 'stt_notify'); // bbpress bug, fires multiple times?
global $bbdb, $topic_id, $bb_current_user, $subscribe_to_topic; $time=time()-60;
$topic=get_topic($topic_id); if (empty($post_id) || empty($bb_current_user->ID) || ($topic->topic_posts<2)) {return;}
$query = "SELECT username, useremail as user_email FROM subscribe_to_topic WHERE topic = ".$topic_id." AND type = 2 AND time < ".$time." AND post > last";

$emails=$bbdb->get_results($query); if (empty($emails)) {return;}

$topic_link=get_post_link($post_id);
$unsubscribe=add_query_arg( 'unsubscribe', $topic_id, $topic_link);
$from=bb_get_option('from_email'); if (empty($from)) {$from=bb_get_option('admin_email');}
$from_email='From: ' .$from;
$user_name=get_user_name($bb_current_user->ID);
$subject="[".bb_get_option('name') . ']' ." ". __('new post notification');
$message = __("There is a new post on [%1\$s] \n\nReply by: %2\$s \n%3\$s \n\n\nUnsubscribe: \n%4\$s \n");

foreach ($emails as $email){
mail($email->user_email, $subject, sprintf($message, $topic->topic_title, $user_name, $topic_link, $unsubscribe), $from_email);

$ids[$email->user_id]=$email->user_id;
// print "$email->user_email
\n";
}
if (!empty($ids)) {
$ids=implode(',',$ids); $time=time();
$bbdb->query("UPDATE ".$subscribe_to_topic['db']." SET last=$post_id,time=$time WHERE topic=$topic_id AND user IN ($ids)");
}
}

find function "stt_change_level", I've modified it so it like:

function stt_change_level($user_id=0,$topic_id=0,$level=0, $user_info = "") {
global $bbdb, $subscribe_to_topic, $bb_current_user;
// print("<hr>

");
    // print_r($user_info);
    // print("

if you're still battling, email me: trippygrape [AT] gmail dot com and i'll send you my modified code which you can work on as a guide

cheers,
John

Also is this installation running off the same wordpress or are you allowing access from a user base on another host? I ran into a couple of walls with this plugin as bbpress lives on a subdomain on it's own and shares the user tables from our main site, but with some modifications works like a dream.

Thanks