The MCH is the android device.
You need to run the utility script with python2.7 on the command line.
It will ask your MCH login to find your device, the location of the apk file and the package name.
Then it uploads and installs the apk.
At the end you get a link to connect to the service.
If all went well, this url redirects to http://IPADDRESS:6789 and you can login with nzbget - tegbzn6789