I’m trying to set up a simple one-page site for my book. I chose Paradise because it is simple and says I can use a custom header. However, once I installed it, I don’t see any way to upload my own header. I’m a little new so I might be missing something.
That’s not a free hosted WordPress com blog. You are posting to the wrong support forum. This one is only for free hosted WordPress>COM blog issues. If you don’t have a username account at WordPress.ORG click http://wordpress.org/support/ and register one on the top right hand corner of the page that opens, so you can post to the support forums there and receive advice from WordPress.org bloggers.