It's easy! Just follow these steps:
1) Click the green "Back This Project" button
2) Choose the "Reward" you'd like to receive, and then select your shipping destination from the drop-down menu.
3) Before adding your payment info, you'll be prompted to either create a Kickstarter account or checkout as a guest
4) Enter your payment information
5) Click the "Pledge" button and you're all set!