Hello and welcome to JustAnswer!
When do you get this noise? Is it something that happens when you are sitting still and you turn the steering wheel, or is it a something that happens while you are driving down the road and swerve left and right a little?
Its not horrible, but you may need a special puller to get it off. You have to remove the brake caliper and rotor, the axle nut (VERY tight, a couple hundred ft lbs), and then the bearing can come off. It will be rusted into the knuckle, so you may need to drive it out with a sledgehammer, air hammer, or a special puller made just for pulling these out.
Hear is a link to the bearing at Napa. You may be able to find one cheaper at an Autozone, Pep Boys, Advance, etc.