Shut water off under faucet,open it to prove wtr is off. pry off cap , slide edge of putty knife,butter knife.etc should see a phillip's screw.remove,pull handle off, pull chrome sleeve off, now. toward's top you should see a little tab sticking out, it is part of a horse shoe shaped clip,pull with needle nose plier's,or similar.pay attention how it come's apart ,your new cartridge come's w/detailed instruction's,calmly refer to 'em, you may need or may not need a moen cartridge puller,(use a good grip,steady pull,)