Fun captcha

i want know the public key and service url of fun captcha should be look like what?if can tell me a example
like want to know for service url,do i need search in inspect for url of the captcha,or it is the url of the main website which captcha based on login
cuz always i see error of the url

Search on the documentation of anti-captcha or 2captcha (on their websites) they will tell you where to look.