Trying to search that POS KMS isn't easy. The link I was sent in email doesn't work either. But, what they said to do from root is issue the following command:
signal-event post-app-install
When I tried it it didn't work, but checking the signal-event options, I discovered that there is an app-post-install. So, from root do a:
signal-event app-post-install
I let them know of the documentation issue and if you find it it will likely still have the wrong info :-)