Thank you for reaching out here in the Community!
To change your display name, a mobile device is required:
- Tap Home , then Settings .
- Tap View profile.
- Tap EDIT PROFILE.
- Tap your display name to change it.
- Tap Save.
For more details on how to edit your profile, you can take a look at this support article.
If you don't see that EDIT option, I'd recommend performing clean reinstall of your Spotify mobile app. It's different than regular reinstallation. Just find your device in this article and follow the steps provided there.
If you can't change your personal information on your account overview, it's most likely because you created your Spotify account with Facebook.
In this case it won't be possible for you to change the email address on your own, but you can reach out to Customer Support and they will be happy to update it for you.
For more steps, make sure to check out this Spotify Answer.
I hope you'll find this helpful!
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Note: I'm not a Spotify employee.