I also got stuck on this part. I also have moodle 2.4 and when I reached Administration and Configuration, I don't see the lightwork functions they are talking about.
And when I try to connect to moodle from lightwork client, I get and error message saying "SOAP message MUST NOT contain a Document Type Declaration(DTD)".
What am I doing wrong here? I have installed lightwork local server addon, enabled Networking on moodle, the public key also get generated successfully, I have even enabled web services and enabled SOAP even. And also created the External Service for lightwork but no function is imported to that service since there is no function prefixed as lightworks (followed this guide http://docs.moodle.org/dev/Lightwork)
Can anyone please help us?