Recovery email
How to change my recovery email or add another one?
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To add another rescue mail address that is always added in the Apple ID account , sign in with Apple ID account , if it's not yet added create a web mail account say with gmail service .
Make sure this mail address and password should be totally different than your Apple ID address / password see the section of rescue mail address in this article About your Apple ID email addresses - Apple Support  in the same Mac open a new tab ( press command and T keys ) sign in with your gmail account here in the web mail account you will see this code , come to the old tab in which apple id account is already opened , fill up the code in the fields and click on done to save .