You have my sincerest apologies for the delayed response here, we’ve been dealing with a higher-than-usual volume following our release and we’re working as quickly as we can to get back to everyone.
Following up on @Martin_Webster’s note, it sounds like you’re trying to run Roon off a mobile device, which can only be used as a remote to control Roon. Do you still have the ROCK you mentioned in your original post?
No worries at all about the delay! Sorry to hear the ROCK didn’t work out.
You’ve almost got everything you need - just missing one essential piece of the puzzle, a device that can be the brain of your Roon operation. I think this article may provide some additional and helpful information:
Do you have a PC or Mac computer you might be able to use as a Core as a starting point?