need help fast!

I'm changing my wheel bearing and I don't how to get the drive axle/hub nut off. Its not a regular nut its a round type thing. Do you just put channel locks on it and turn or what? Its hard to get to for the lug bolts. Its a 4 wheel drive. Thanks in advance.

 

I got it off. It was just a little cover for the actual nut.

 

Just half to say love the sig, " turkey hunter" and a pic of a deer.