Server url for the official example in the lib-jitsi-meet?

Hi thanks very much for the library! I am trying to reproduce the example in the lib-jitsi-meet (here)[https://github.com/jitsi/lib-jitsi-meet/tree/master/doc/example]. However, I get confused what urls should I provide? I can set up my own jitsi docker servers, but there are several configs and I did not find documentations describing which relates to which.

Thanks very much!