Captcha can be used to prevent your form from being accessed by spam. By default, you can directly enable Captcha in the Captcha sub-configuration.
Select Yes to enable Captcha.
Enabling with Custom Domain Page
If you are using the custom domain feature on the Page, you need to add the site & secret key code first to use it. Follow these steps to get the code:
Click Get reCAPTCHA to enter the admin dashboard. If you are not logged in with your Google account, please log in first.
In the Label, fill in the field with the label name you want.
For the reCAPTCHA type, select reCAPTCHA V2.
In Domains, fill in the field with the domain you connected to the MTARGET custom domain. This domain must match; otherwise, the reCAPTCHA will not work properly.
Click Agree
Then click Register
You will then be directed to the Dashboard page. There, you will find the site & secret key. Copy the code to the form's Captcha settings. Then click save.
Thus, the Captcha on your page will be immediately activated.