Unbolt the bolts connected to the flangettes around the bearings, and the brake cable from the brake drum. The axle should drop right out after that. The best option for removal is to buy a can of penetrating oil/penetrating catalyst/rust buster(goes by many names) spray it on the axle where the sprocket, passenger bearing and rim are. Get a big hammer and persuade the wheel/sprocket/bearing off. If you are having trouble removing it, spray it with penetrating oil once a day and let it sit. Sometimes it helps to remove the axle key first. Use A big nail or 1/8th inch rod and tap the key out of the wheel and sprocket with a hammer. Removing the axle key first will let more penetrating oil in, and reduce friction when you are pounding on the sprocket.