Hello @jc.cabrero and welcome to the forum.
It sounds like you might have an issue with access rights. Sadly this is a guess from my side because it is not clear what exactly is your state, “I don’t have access to anything!” can be interpreted in so many different ways. Did you read and follow the installation instructions from the project page and then the installation wizard of the software regarding rights? Please try to clarify the staus of your installation for others.
Note: You can also post screenshots here.
Another worthwhile read is IMO the following thread that explains a lot for NAS installations:
Disclaimer: This is a reply from another Roon user.
Addendum:
I hope you upgraded the 2GB RAM on this NAS as 4GB are highly recommended for Roon and more might be needed depending on the size of your music library (and what else the other software running on the NAS needs).