Missing Artist Name in Album

I’m a ROSE 250 owner since one year.In my mediathèque I have many albums that have no artist ! When the ROSE 250 scanned my mediatheque it dont found the name of artist for 140 albums !
I used to use JRIVER and I had spent time putting all the tags and all the metadata are correctly filled in.
If I try to acces to métadata info , I see that it is missing the name of the artist but the problem is the system does not allow filling the metadata !!!
When I try to go to editing the system does not allow access to the artist field

When are you going to solve this very important problem?
It’s very punitive and boring !
thank you in advance for your answer
Pascal