There is a bolt on the bottom of the water pump cover. On the Hondas, if it's the original bolt, usually has a 10mm hex head and a Philips screwdriver indent. They usually have a copper washer under the bolt as well. There may or may not be a similar appearing screw on the side of the cylinder in the middle. If there is, this one needs to be pulled as well. Don't forget to remove the radiator cap while you drain.