Here is the way to easily make changes to your event registrant for several things:
1. First click on your event tab on the left hand side
2. Then hover over your event you want to see and choose registrations
3. Once your registrations card is open for the event you chose, click detailed edit on any of the registrations you are looking to manage:
4. From the Edit Menu, you want to click on the pencil in the transaction row:
5. From this screen, you can now choose several things you need to do within the task button below at the bottom left like resend your email, refund the transaction and for the credit card, partial refund, re-charge, generate an invoice document change the payment etc...
6. Once you've completed all of these tasks, the contact will receive an email with the information on the refund and you can resend the email to yourself with the BCC email.