I am sorry you are unable to change the Unsubscribe email address in your account. When editing the Unsubscribe email, you would start by going to the "My Account" option at the top right of your Constant Contact page. That will be located in the icon that looks like a profile of a persons head.
Once you are in your My account page, you will edit "User Email" on the left hand side under "My Profile".
The email address that is listed under "User Email" is the email address the Unsubscribe notices will go to. Right now, I see that you only have one email address linked up with your account, so that should be where your notifications are going to. Unless you verify a new email address to be added to you account, you will continue to be emailed through the main one added in your account!
Hayley L Community & Social Media Support
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