* Using the trunk release button inside the car: This is usually located on the driver's side, near the driver's seat, or on the center console. It's often a button or a lever.
* Using the key fob: Most 2008 Impalas came with a key fob that has a button specifically for unlocking the trunk.
* Using the key: There's usually a keyhole in the trunk lid itself. You can insert your car key and turn it to unlock the trunk.
* Manually (if other methods fail): In some cases (dead battery, malfunctioning release mechanism), you may need to access the trunk release cable from inside the car. This typically involves removing some interior panels. This method is more complex and requires some mechanical aptitude. Consult your owner's manual for the specifics on how to do this for your model year.