Q: What do you do if you don't remember setting up a rescue address but it shows you have one?

You can change or remove the rescue email address on your account by following the steps on the page that posted from i.e. log into your account via the 'manage your apple id' button on http://appleid.apple.com, select the 'Password And Security' section, and answer the two security questions that show.

If you can't remember your answers to your questions and don't have access to the email account that shows then you will have to contact Support in your country to get the questions reset, and then do the above for potential use.

Contacting Apple about account security : http://support.apple.com/en-us/HT5699

If your country isn't on that page then try this form to contact Support : https://ssl.apple.com/emea/support/itunes/contact.html