1. Go to Communities > Forms: Single Step Donation
  2. Hover over your form's name and select Webinfo Checklist
  3. Click Donation Form Options*
  4. Click the Confirmation Text tab 
  5. Un-mark the notification
  6. Click Save
  7. The page should refresh.  Click the Confirmation Text tab
  8. Paste the email address
  9. Mark the notification
  10. Click Save
  11. On the Webinfo Checklist, Click the green Update Event Now button.