Remove cap off of rear wiper arm. Remove nut. As this is a fine splined shaft, you may want to mark the position of the wiper to reinstall it in the exact same position. Now you'll need a wiper puller. Generally found at your local auto parts store. This same puller can be used for the front wipers too. I purchased one for $10.00. Inexpensive compared to what I'm sure a dealer would charge.