How do I change my email alias in icloud
How do I change email address/apple id alias in iCloud? This is not my sign in email, but the secondary email (alias)
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If you mean the alternative versions of the main iCloud address - for example something@mac.com or something@me.com oin addition to something@icloud.com these can't be changed as they are all in effect the same address.
However you can create an 'email alias' which is different, being a separate address (not account) which delivers into the inbox alongside messages to the main address and its variants.
You should be aware before you start that once you've created an alias you cannot turn that address into a full iCloud account or move it to another account.
More information on aliases here: Add and manage email aliases for iCloud Mail on iCloud.com - Apple Support