I followed all instructions posted on iCloud support, but none of them answered correctly.
I'm also following these steps...
- Go to Settings > iCloud > Account, then tap Mail under Advanced.
- Under iCloud Account Information, tap your email address.
- From the list of addresses available, tap the @icloud.com email address that you want to use as the default address for sending mail from iCloud Mail.
...but still can't change my iCloud addres.