The cap that says Auto Hub unscrews from the hub body. You'll need a set of channel locks or a rubber oil filter wrench to unscrew the cap if the grease is all dried up. Inside the hub body is a C clip fixed to the end of the CV shaft. Once the C clip is pulled and the 6 hub bolts removed, the hub body slides off the CV shaft. Once you have the hubs off, either clean them really good and relube all the workings, or replace them with Aisin manual hubs (also available new from plh at 4x4Wire/Pirate/MightyD50.