The wheel bearing and hub are pressed into the steering knuckle, so you will need to remove the knuckle and then there are some special tools required to get the bearing out and the new one in.
Here are the instructions....
CAUTION: The strut assembly-to-steering knuckle attaching bolts are serrated and must not be turned during removal. Hold the bolts stationary in the steering knuckles while removing the nuts, then tap the bolts out using a pin punch.
NOTE: Use caution when separating the ball joint stud from the steering knuckle, so the ball joint seal does not get cut.
NOTE: Do not allow the driveshaft to hang by the inner C/V joint; it must be supported to keep the joint from separating during this operation.
NOTE: The cartridge type front wheel bearing used on this vehicle is not transferable to the replacement steering knuckle. If the replacement steering knuckle does not come with a wheel bearing, a new bearing must be installed in the steering knuckle. Installation of the new wheel bearing and hub must be done before installing the steering knuckle on the vehicle.