2003 Buick Regal location of freeze plugs

Coolant leak under front of engine. I've checked all hodes for leaks, chececked thrmostat to see if it need to be replaceb. Now the car has starte whisling when I tiurn the car off. I've had to add water to to radiator. It has started to get hot but not overheated yet. I pretty sure its a freeze plug. Do I have to pull the engine to replace the frezee plug, I dont have have the crane nor do I know where thw plugs are located.