You cannot change an existing Reddit username
Reddit usernames are permanent once created
You can create a new account with a new username
Log out of your current account
Sign up for a new Reddit account
Choose the username you want during signup
If you used Google, Apple, or email to sign up, create a new account with different login details if needed
If you want to keep your posts or comments, they will stay on the old account
You can delete your old account if you no longer want to use it