The first step in replacing your u-joint is getting at it. To do this you;ll need to remove the drive shaft. On some vehicles you remove the drive shaft by removing the universal joint. If your vehicle is like this, follow the instructions that follow and your drive shaft will drop.
If your drive shaft attaches with axle type bolts (a circle of bolts with either hex or allen heads), proceed to remove that end of the driveshaft like the photo above. If your driveshaft does not have this type of end, move to the next step to see how to remove it.