antispam bot – need help

What is the link to the plugin? There are many anti spam plugins.

I’m using one (I’m not on 2.5 yet – still on 2.3.3) that stopped virtually all of the bot spam because it uses rotating math questions (not the same every time).

https://sw-guide.de/wordpress/plugins/math-comment-spam-protection/

Did you follow these directions?

This plugin can be installed in 5 easy steps:

    * Download the plugin (see “Downloads” above).
    * Decompress the .zip archive and put the files into your plugins directory (/wp-content/plugins/) or into a sub directory of the plugins directory.
    * Enable the plugin in the WordPress Plugins admin page.
    * Go to Options / Math Comment Spam, adjust the options and save.
      Important: You need to save the options when you use this plugin the first time or if you have updated from a previous version.
    * Add code to the comments.php of your theme. In the following an example for the WordPress standard theme (Kubrick):

      <?php
      /****** Math Comment Spam Protection Plugin ******/
      if ( function_exists('math_comment_spam_protection') ) {
      	$mcsp_info = math_comment_spam_protection();
      ?> 	<p><input type="text" name="mcspvalue" id="mcspvalue" value="" size="22" tabindex="4" />
      	<label for="mcspvalue"><small>Spam protection: Sum of <?php echo $mcsp_info['operand1'] . ' + ' . $mcsp_info['operand2'] . ' ?' ?></small></label>
      	<input type="hidden" name="mcspinfo" value="<?php echo $mcsp_info['result']; ?>" />
      </p>
      <?php } // if function_exists... ?>

      Add this code for example right after the field for the website URL.

No, I just put the folder in my plugins folder and everything worked fine for me.

[edit: Actually, I’ve been using it for a while and now that I think about it, I do remember editing the comments.php.]

I should mention that I’ve upgraded to 2.5 and changed themes so my changes to comment.php are now gone, so I don’t know if it is compatible with 2.5 or not (I haven’t activated it after upgrading). Probably ought to check with the author before hacking comments.php.