@icloud.com email associated to Apple ID

Hello,

I already asked for this thing 2 years ago.

In the end I didn’t give to this fact any importation, but now I want to resolve it.

I have an Apple ID as everyone, but I have the @icloud email of my sister associated to it (as you can see in photos below).

Is there someone who can tell me how to change this @icloud email with another one or how I could completely remove it from my Apple ID account?

Thanks for your support,

Stefano