The documentation for those examples is available here - in case you missed it.
First, do copy the entirety of the elk-examples repo to /udata
Second, you will need the plugin binaries, linked in the documentation above, which you yourself need to place in a folder named ‘plugins’, inside the elk-examples directory.
With that in place, this should work for you:
the first time you run it it will ask for your password (elk).
And then to stop: ./stop
If you get any error messages, it is likely file-paths being wrong, and you will be able to deduce the culprit quickly by checking the messages in /tmp/sushi.log
I should add a link to the above documentation in the README.md of the repository.
Let us know how it works out!
Ilias of Elk.