Hey there @Momiitap,
Thank you for posting on the Community! Hope you don't mind us relying in English, as it is the official Community language.
In order to join a Family plan, your subscription type first needs to be switched to free 🙂
If you're a Duo member, you may ask the person who manages the Duo plan to remove you from it.
Let us know if any further issues arise.
Cheers!
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…