Your first picture shows an AFP-share. Roon needs an SMB-share.
Excerpt from the FAQ I linked in my first post:
- Don’t enable AFP or Timemachine if possible – some users may need this functionality for other applications, but they’re not needed for Roon. You can find more information about why AFP is not supported here.
Please disable AFP on your DiskStation at least until you got Roon working.
After that open finder and search for the SMB-share(s).