Thanks for reaching out. Welcome to the community!
Here are the steps to remove a song from one of your playlists:
- Tap in the top-right corner of the playlist.
- Tap Edit.
- Tap to the left of the song.
Note: You cannot edit playlists that are not a collaborator on, do not own, or playlists that Spotify makes just for you, such as Discover Weekly and Release Radar.
Let me know if you have any questions. Happy listening 🙂
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Note: I'm not a Spotify employee.