You can find it on your Start menu on Windows, or in your Applications folder on Mac.
This will open the playlist’s contents on the right-side. You can also click New Playlist on the bottom-left, and create a new playlist before sharing it.
Alternatively, you can right-click on the playlist’s name on the left sidebar.
You can now share it with other users, and they can freely add or remove songs. You can undo this the same way. Just click the three-dot icon, and click the checked Collaborative Playlist option. The checkmark will disappear, and other users’ access will be revoked.
Alternatively, you can click the three-dot icon next to a song or album. It will open the same menu.
Other users will be able to view, play, or remove these songs on the collaborative playlist.