Hello @Caroline227 ,
There's no such thing as an unsubscribe address. The only email addresses that show in an email's footer will either be the sending address for that particular email (editable via the email's header / scheduling page), or the address of the recipient after the email is sent out. Previews / test sends will pull the account owner's address for those example formats, live sends will be the actual contact's email address that you had us send it to.
For more info on how unsubscribes work
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