To delete a registered participant (that was creating through testing, by accident, etc):
1. Go to 'Registrations'
2. Click 'View' under the Participants tab
3. Find the participant to delete and click 'Delete'
4. Press 'Delete Participant'
NOTE: If this participant has made an online payment, you will want to refund them (if applicable) before deleting them. It is always best practice to have the participant's Balance $ Owing at $0.00 when deleting a participant.