Can't add a song to MyMusic

Hi,

I've subscribed to the Apple Music trial and enjoyed by adding songs I listened online to MyMusic section. Later accidentally I turned off some switch on the Music app interface and now in the popup menu there is no option to add a song to MyMusic. No idea how to return it back.\

P.S. After I pressed that switch My Music now shows only the music I've purchased and nothing from the songs I marked as 'add to my music'. The 'my music' section (media tab) is now stuck with showing the progress bar named 'loading media'... The playlist tab also shows the never ending progress bar 'loading playlists'.

Any idea how to fix that?

Thanks,

Anton