Plumbing Questions? Ask a Plumbing Expert.
Turn water off to faucet. First you need to take an alien wrench and loosen set screw and remove handle.
You will see the round nut (cap), take a pair of channel locks or small pipe wrench and turn this nut (cap) counter clockwise. If this nut does not come loose easily do not force it. Let me know if it does not come off or does come off.