Hello!
If you're referring to your Apple Music Profile you can change this at any time.
I don't use Android or Windows so these steps are for iOS. They might be similar, but might not be:
- Open the Apple Music App
- Tap on Listen Now (bottom left corner)
- Tap on your Apple Music Profile (top right corner)
- Tap on "View Profile." It should say your name here as well
- Tap "Edit" underneath your profile picture, name, and username
- For "Name" change your name to whatever you'd like
- If you want to change your username, change the "Username" field.
If you're referring to your Apple ID name not changing, please try signing out and back in again.
I hope this solves your problem! Happy Listening 🎶