What does it mean is the password and login for the parser where to get it?

Question

Passwords

Help me understand or how to do it right?
"answer please what does it mean this is the password and login for the parser where to get it"
"In the parser you need to specify the data of the proxy servers, not the hosting, I found this phrase, what does it mean?"
curl_setopt($curl, CURLOPT_PROXYUSERPWD, 'login:password'); in this line, as you understand, I indicated the hosting, you need a login and password, you need to specify the data of the proxy servers, and not the hosting? how to do this do not tell me what would the parser work?