Installing reCAPTCHA Manually

i want to Installing reCAPTCHA Manually for user Registration

after getting site key and a secret key from Google, I have to add the code in the header of our form’s PHP or HTML file.
Please guide where can found this form’s PHP or HTML file in File manager of our Domain

OJS version

domain Through Hostinger

It’s better add it in the OJS, there is a special section for it:

; Captcha Settings ;


; Whether or not to enable ReCaptcha
recaptcha = off

; Public key for reCaptcha (see
recaptcha_public_key = your_public_key

; Private key for reCaptcha (see
recaptcha_private_key = your_private_key

; Whether or not to use Captcha on user registration
captcha_on_register = on