Tom ..... remove the expansion tank cap when the coolant temperature is cold. Locate the bottom hose to the radiator and loosen the clip securing the hose to the radiator. Remove the hose from the radiator and allow the water to drain into a suitable recepticle. Refit the hose and re-tighten the clip. Add the correct amount of antifreeze to the expansion tank. Fill the tank to the correct level with water. You may find that you will have to add more water once the air has found its way out of the system.
