How to change Site email:

1) Under "Site" menu on the left hand side of the builder

2) Select "More"

3)Scroll down to the bottom and click "Options" at the bottom right corner of the builder

4)Click on the "Account" Tab on the right hand side of the builder

5) At the bottom of the "Account" box you will see "email" 

6) Here you can change the email that is connected to your product and customer feeds. 

Make sure to publish after you have finished your changes.