1. Navigate to Communities > Forms > Contact
  2. Hover over the form name and select Website Info
  3. Click Contact Form Options
  4. Click the Advanced Confirmation Setup link 
  5. Click Edit and then Edit Email 
  6. Edit email as desired and click Save when finished
  7. Close out of email window and click Finish at the bottom of the page
  8. Click the green Publish This Event Now button to update changes