Help to install Jriver and ZimaOs

Hello from Germany,
I am an absolute beginner as far as this is concerned, so far everything works with the ZimaOs, but I just can’t get the JRiver installed.
I don’t understand what I have to do and hope that you can help me here.
The instructions from ZimaOs on how to install JRiver confuse me even more and I am now standing in a forest full of trees
I would be happy about support how it works
Greetings Ricky

Translated with DeepL.com (free version)

I heard some App Stores for CasaOS/ZimaOS are actively adding new apps. You could probably send an app request. This is a good location I found:

What do you think?

If I understand correctly, I can ask them if they can make a jriver app for the zimaos? That would be great.