first, try out my demo user - it's my online music store:
!! Username: andrew
... Password: andrew
then login to
https://forum.drugs-and-users.org/owncloud/index.php/apps/media... you can try the
Files app. or the
Music app. running down the left-hand side of the display.
apps can be installed but that's for later ... but have a play around and see if it interests you.
then, when you see what it is and/or does, ask me to create a userid for you.