Navigate to <https://open.spotify.com/> or open the Spotify app
2
Click this icon to make sure you do not already have music queued. If you already have music queued, not all of the new playlists you wish to add will play.
3
If "Clear queue" is visible, click it to clear the way for your next batch of music.
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If you had to click "Clear queue", next click "Yes" Your queue is now ready to be filled with new music.
5
Select the first playlist to add to your queue.
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Click play.
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Select the next playlist to add to your queue.
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Click the 3 dots.
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Click "Add to queue".
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Go to the third and final playlist you would like to queue and click it.
11
Click the three dots.
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Click "Add to queue". You now have all 3 selected playlists in your queue, and your music will continue to play until all 3 playlists have finished.