Where do you control donation confirmation traget email?

I have a non-profit site. With each donation, I get an email to my account as a notification. I want that email to go to a different address but I can't find where to change it. It must be so simple, but I'm stumped.

Greg, I have the same question. We have a non-profit site, they register for a show and i get the notification that the registration has happened, but I am not seeing how to send them the Thank you for registering. Did you figure this out? Levi

The thank you is part of setting up the item for sale. Somewhere in the pop up box is an option to customize it.