How do you jump another car with a 2007 buick lucerne

Are you supposed to jump off the battery which is under the back seat, as there is just a + terminal under the hood , which is not like just any other car. My hyundai has the battery under the hood. I used to have a dodge stratus with battery in wheel well. Not all cars are set up the same way. Your answer is so vague you might as well not answered.

Any vehicle with computer controls should never be used to jumpstart another vehicle, the electronics do not like voltage spikes. The safest way is to use a capacitive type jump box, follow the instructions and things will go just fine.