How to Create an iCloud Email On Mac PC

Step1: Go to the Apple menu > System Preferences.

Step2: On macOS 10.15 or later, click Apple ID/Apple Account > iCloud > Mail, and then follow the instructions.

In macOS 10.14 or earlier, click iCloud > Mail, and then follow the prompts.
After you set up your @icloud.com email address, you can use it to sign in to iCloud. You can still use your original email address to access your Apple Account.

Credit : https://www.lifewire.com/how-to-create-an-icloud-email-4584873