To learn how to remove the leg/thigh quarter, see the "Breaking Down a Chicken" pictorial.

Hold the leg/thigh quarter in your hand. Pull the bone of the thigh toward the bone in the leg.

This will create a dimple between the leg and thigh. This is the natural division between the two. Carefully make a slit down the division.

Turn the quarter around. Make the same slit down the other side.

Lay down the leg/thigh quarter. This will expose the joint between the leg and thigh. You should now be able to easily cut though the joint.

This will fully separate the leg from the thigh.