When you set up your Wuthering Waves account, the email address you use is likely the one you’ll use for the rest of the game. That doesn’t make life any easier for those who want to change it.
How to Change Your Email Address in Wuthering Waves
Kuro Games doesn't make it easy to change anything, and even finding options to do something with your account is buried in so many settings menus, it's unbelievable. When you finally get to the place where you should be able to change your email address, you're met with a huge disappointment.
No, there is no way to change your email address on your Wuthering Waves account. There is a way to log in through other means, but once you link an address, it is tied to your account forever and you can no longer like it.
By logging into the game and going to the settings menu, you can scroll through the sidebar until you reach the User Center. Clicking on this will bring up a menu with your email address associated with your account and a few other options.