Dear Mr Charles "WebMaster" Guthier,
To put it bluntly, you're doing it wrong.
It astounds me that you cannot use such a simple plugin, and astounds me even further that you blame your ineptitude and obvious lack of experience on the author of this wonderful plugin. You owe this individual an apology. Especially seeing as how two people have offered to help you configure the plugin. (Even though it's so simple.)
You're a "WebMaster", seriously?! Not only is it an antiquated title, but in all my years of technology, I have only met a very rare few people who appear to have any sort of TRUE "Mastery" of the web. I don't feel it to be a very fitting title in this case if you can't seem to configure a simple captcha. I fear for the well being of your company's website.
In closing, I am going to donate more money to the author to aid in the continued development of this plugin and may even offer some input on it. Why? Because I am a developer, I love this product, and I can (and in a very small part due to your wrong and unfair complaint).