Removed the ability to share tracks from Spotify to my app because the Spotify app sometimes does not send the playlist's ID to my app and thus makes the app not function properly.
There is no easy way to delete the current playing song in a playlist on Spotify.
You simply share the song with this app and it deletes it from the playlist for you.
Or, you could open the app while playing the song.
The system will detect the current playing song and playlist and help you to delete it easily.