Unable to install with Melco N1

[pdcman]

OK, it seems to be up and running in Kazoo. It took longer than I thought, but I can see it via this app and play music.
I cannot however, access the folders via file manager on my PC. It can see the melco, but I cant connect to it. It asks for a username and password for access, which I've not seen previously!
Have I missed a step?
Thanks for any help offered. .