After you've logged in to your Kickstarter account, visit your project page. You’ll see a "+" icon in the top left corner labeled “Page theme”, which you can use to change your background color, background image and text color.
You'll also be able to edit your project title and blurb by clicking the pencil icons to their right. There’s also pencil to the right of the pledge button to edit it's text and even add a link to whatever page you’d like. You can see this blog post for some ideas!