After checking the box "This order is a gift", click the "Email a message" button and enter your name as well as your recipient's name and email address.
Send your best wishes or write a cute haiku and click the "Save message" button.
Don't worry if you're not happy with your message or there's a typo, you'll be able to edit your message after saving it, and before confirming your purchase. You can also click on "See how it works" to preview the gift message experience.