In order to install YouTube Music with GNOME Software, launch GNOME Software,
search for YouTube Music and finally click the Install button.
a Linux terminal emulator,
type flatpak install nuvola eu.tiliado.NuvolaAppYoutubeMusic and press the Enter key to install this package.
Launch YouTube Music
You should be able to find YouTube Music in a list of installed applications. If not, you may have forgotten
to log out and log in and your desktop environment (Pantheon, GNOME, etc.) has not find out yet
that a new application has been installed.
Alternatively, you can launch YouTube Music from a terminal:
flatpak run eu.tiliado.NuvolaAppYoutubeMusic