How do I delete an alias from my Apple ID

@iCloud.com, @mac.com, and @ me.com aliases can't be deleted.

iCloud: Create an email alias in iCloud Mail

Change, turn off, turn on, or delete an alias

1. Click the Action pop-up menu in the sidebar, then choose Preferences.
2. Click Accounts.
3. Select the alias in the Addresses list, then do any of the following:

   Turn off an alias: Select “Disable alias.”

   Delete an alias: Click Delete.

4. Click Done.

Sorry to follow up, but when viewing this answer within Apple Help Discussions, I do not see an Action sidebar nor do I have an iCloud account (I assume based upon the alias, that one of my children created said alias account under my parental Apple ID/iTunes account) - they do not have my password to access my parental account, so maybe I am wasting time trying to delete the alias, but I guess I am just funny like that .... appreciate any guidance

Your Apple ID will allow you access to iCloud.com and iCloud in general.