Confirmation emails are automatically generated after successfully placing an order and sent to the email address you provided during checkout. Sometimes this can take a bit of time to arrive, but usually it arrives right away. Make sure you are checking the correct email address, and most importantly CHECK YOUR SPAM FOLDER.
Sometimes spam filters work a little too hard and grab emails that are automatically generated. It’s always a good idea to periodically check your spam folder and make adjustments to your spam filter to make sure it is working efficiently and not blocking emails that you actually want to receive!