Why does Registration ask for Captcha, when it's not enabled?

I've just tried to register a user account on our new forum, but straight away it says "To use reCAPTCHA you must get an API key from https://www.google.com/recaptcha/admin".
This is really really bad. Why on earth add something if we are not told how to enable it and use it?
So how do I stop this being used, or even how do I punch in the codes that google gives me, as I see nothing in the Dashboard about doing this.
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@simona6
You have put this in Vanilla 2.0 help, but I assume you are using 2.2. 2.0 questions don't appear on the main page.
Please see this discussion, if you want to try to disable captcha.
https://vanillaforums.org/discussion/comment/235402/#Comment_235402
Otherwise, simply register with Google for the keys, and add them via the Registration link in the Dashboard.
I get that it is frustrating, but please remember that most people on here who answer questions are not affiliated with Vanilla, so sounding cross can be a bit off-putting.