Sure, here are the steps to delete unwanted playlists from Spotify:

1. Open the Spotify app on your device.
2. Navigate to "Your Library" located at the bottom of your screen.
3. In the library, you will see a list of all your playlists. Scroll to the playlist you want to delete.
4. Tap on the playlist to open it.
5. At the top of the playlist, you will see three dots (or an icon that looks like a gear on iOS). Tap on it.
6. A menu will appear. Scroll down and tap on "Delete playlist".
7. A confirmation message will appear asking if you're sure you want to delete the playlist. Confirm your decision.

That's it! The playlist should now be deleted from your Spotify account. Please note that this action cannot be undone.