This is a pretty basic DIY but you can't replace the blade in position so I had trouble figuring out how to do it until I saw an exploded Parts view (thanks to Fire0nic3). So I thought I would show how to do, it is very simple once you realize what to do.
First you need a new Rear Wiper, Here's the Part#

Start with the rear wiper in the auto stop position, and remove the wiper arm cover

This will expose the wiper arm mounting nut. Remove the nut with a 10mm socket

Pull the wiper arm off the splined shaft

Now you can easily remove and replace your wiper blade with the new one.
Reinstall in the reverse order.
First you need a new Rear Wiper, Here's the Part#

Start with the rear wiper in the auto stop position, and remove the wiper arm cover

This will expose the wiper arm mounting nut. Remove the nut with a 10mm socket

Pull the wiper arm off the splined shaft

Now you can easily remove and replace your wiper blade with the new one.
Reinstall in the reverse order.