Human Verification Options 
Path to Human Verification options: Settings > Options > Human Verification Options
This setting group controls where human verification is required on your site.
Note:
You must click Save for changes to take effect.

Verify at Registration
Require users to pass the Human Verification test during registration.


Verify Guest Posts
Require guest posters to pass the Human Verification test before their messages are posted.


Verify Guest Searches
Require searches by guests to pass the Human Verification test before the they are executed.


Verify Guest Contact Us
Require guests to pass the Human Verification test before they can leave feedback.

This applies only if sendmessage.php is being used as the Contact Us link and Guests are allowed to use the Contact Us for described in the Site Name / URL / Contact Details article.
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