Apple music collaborative playlist

Hello, annelie03.

Thank you for posting in Apple Support Communities. If we understand correctly, you and your friend would like to create an Apple Music playlist that you both can edit, and you’re wanting to know if this is possible. 

While it isn’t quite possible to truly collaborate on an Apple Music playlist where you can both add songs, you can create playlists to share with your friends. When you add a playlist that a friend has shared to your Apple Music, any time they make a change it will automatically update on your end, too. 

First, create a playlist and make it public.

How to make a playlist in the Apple Music app - Apple Support

Then either use the Apple Support article that you referenced to share the playlist with your friends, or show them how to find you as an Apple Music friend:

See what friends are listening to in Apple Music on your iPhone, iPad, iPod touch, or Android device - Apple Support

Warmest Regards.