In addition, CAPTCHA can make the registration process significantly less accessible, particularly for individuals with visual impairments, such as those who are blind or have low vision.
- Add the values to your Mastodon environment configuration as `HCAPTCHA_SITE_KEY` and `HCAPTCHA_SECRET_KEY`
- Restart the Mastodon services running on your server
- From the Mastodon web interface navigate to **Administration** > **Server settings** > **Registrations** and check the box labled "Require new users to solve a CAPTCHA to confirm their account"