- Go to Administer > User Management > CAPTCHA and check:
Add CAPTCHA administration links to forms.
- Create the Webform. Do not click on the CAPTCHA link at the bottom of the Form Create page.
- Save the form.
CAPTCHA: no challenge enabledat the bottom of the newly created form (when Viewing, not editing the form).
Place a challenge here for untrusted users.
Go to admin/config/people/captcha/captcha/settings in the blank text box under "Form Protection" enter the form_id (not the node id) of the webform and save the configuration. Go to the webform page (as Anonymous user) and you should be able to see the captcha there.
To quickly find the form_id of the webform, take the node id and append it to "webform_client_form_", for example if the node id is 3 your webform form_id will be "webform_client_form_3". You can also use firebug to inspect the form_id field.