Make sure you have Contact Form 7 installed as a plugin and you have a contact form
- Navigate to Contact » Integration
- Clcik on google.com/recaptcha/
- Login with your Google Account
- Enter the website domain in Label and in the Domains
- Select reCaptcha version. Older contact form select v2
- Sslect Checkbox for simple captcha
- Copy the Site key and Secret key
- Click Register
- Paste the the Site key and Secret key in the Contact form integration
- Login to to your Wordpress Admin
- Open the contact form to edit and insert [recaptcha] above send button