Iris: Artist / Album and Track library URI values

Hi

Im using mopidy-subidy extension and iris. Iris has the ability to define custom URI for the Artist / Tracks and Album register (i guess?).

Now i try to set these values so that when i click on Artist / Tracks / Album i get the results from my Subsonic server. These URI’s i have tried, but non of them works:

Artist URI:
subidy:vdir:artists?type=artist
subidy:vdir:artists?type=artist
subidy:vdir:artists
subidy:artists?type=artist
subidy:artists?type=artist
subidy:artists

Album URI:
subidy:vdir:albums?type=Album
subidy:vdir:albums?type=Album
subidy:vdir:albums
subidy:albums?type=Album
subidy:albums?type=Album
subidy:albums

Do i misunderstand the use of the custom URI? Can someone explain me this?
Than you