How to apply Captcha to contact form?
Use your web browser to go to Google’s reCAPTCHA site.
Click the blue Admin console button on the upper right-hand side of the page
To create a new Site Key and Secret Key, click + on the upper right-hand side of the page:
The Register a new site form appears. Specify the following information about your site to obtain the Site Key and Secret Key
After create Captcha, Go to CS Contact => Setting at sidebar and apply your site key and secret key
Go to Edit your form, at Config tab go to Option to turn on Captcha.
