To resend the confirmation email, you can see the details here.
Go to My Events>>Manage Event>> View Orders
Find the order you want to resend the email - you can do so by searching their emails or names on the top of the page.
Click on Action.
Click on Resend confirmation email in the drop-down menu
Then, you will see the order details, buyer information, and registration details
Enter the buyer's email to send the confirmation email to the buyer.
Check the box of add CC email in the confirmation email and enter the emails you want to send that email copy.
(Notes: CC the confirmation email is allowed up to three emails. The event owner's email is by default, and you can change and CC the other attendees' email in the order.)
Click on Send to proceed.