Connect iMac Music Library to BlueSound Node 2i

I want to access my Music (formerly iTunes) library on my BlueSound Node 2i music streamer. In trying to set that up I reach:

But I cannot find the path name to enter which the instructions state must be in the format

\\Network Path name\Folder

Any ideas?

I also have a naim ns01 music server on my home network. I tried to access that but reached:

I cannot work out the share name.

Again any ideas?

Thank you