How to active a web service in SICF

I posted a similar question earlier, but I am still not clear how to publish a sap standard web service and get it WSDL URL.

I have a WSDL URL for one of my web services in the ESR, but when I paste this URL to a browser, it says "Service can not be reached". I want to active the service in SICF, but I am not sure how, I am new to PI, so I am just wondering is there any step by step instruction on how to active a service first, with how to publish the service, that would be even better.

Very much appreciate if any input.