1. Go to Communities > Forms >  Registration
  2. Hover over your Registration from name and click Website Info 
  3. Select Registration Form Options
  4. Click Next until you get to Step 5 of 5
  5. Modify the email address and mark the "Send me email notification for new registrants" if you wish
  6. Click Finish
  7. Go back to the Webinfo Checklist and click Publish This Event Now