You can rescan by going to the web interface (http://localhost:port). On the status page you can make it rescan. You can also change the config there to add (for example) an admin password, then you can access the web configurator from anywhere.
Sorry, I shoud have mentioned that I already tried the wiki instructions as well (every step of it).
1. I created the .url file in the specified format.
2. added a .m3u playlist with the .url file
3. edited .conf to enable processing of .m3u and .url
4. restarted server
5. started full rescan.
I also tried to create a smart playlist with the type includes “URL” specification and that did not work either. I’m guessing that if the smart playlist does not work then I should not even bother trying a static playlist.