Assuming you have a GMC Acadia with a dead battery, here are the steps to jumpstart it:
1. Park the working vehicle close to the Acadia, but do not let the vehicles touch. Make sure both vehicles are in park and turned off.
2. Find the Acadia's hood release lever and pull it to open the hood.
3. Locate the battery under the hood and remove the plastic cover (if present).
4. Identify the positive (+) and negative (-) terminals on the battery. The positive terminal will usually be marked with a + sign or red in color, while the negative terminal will usually be marked with a - sign or black in color. In some cases, there may also be white stripes on one of the battery cables near each terminal; this denotes which cable is connected to which terminal (the stripe should point toward the respective terminal).
5. Take the jumper cables and connect one end of each cable to its corresponding terminal on each battery (positive-to-positive, negative-to-negative). Make sure that each clamp is securely connected and not touching any other metal surface on either vehicle, as this could cause sparks/an electrical short.
6. Start up your working vehicle's engine and let it idle for a few minutes before attempting to start up your Acadia; this will help charge up its battery slightly before starting attempt number two. If you have an automatic transmission, make sure your car is in park or neutral during this process! Now try starting up your GMC Acadia - if successful, drive around for at least 15 minutes so that your Acadia can recharge its own battery before shutting down again (or else you'll just be back where you started!). If unsuccessful after multiple tries, then unfortunately you may need a new battery or professional assistance