Raise the liftgate and open the cargo floor box lid by pulling up on this strap. You'll find the jack in a storage compartment below. Remove its cover and you'll see the jack is secured in a holder. Turn the jack screw counterclockwise a few turns. This will release some tension on the jack so you can remove it. The jacking tools are located in a storage bin on the right side of the cargo floor box. Remove the lid to access the tools.
If your vehicle is equipped with wheel covers, you must first remove them to get to the wheel nuts. Do not attempt to use your hands to remove a wheel cover. The end of your jack rod is designed to pry it off.
Your Owner's Manual has explicit instructions and diagrams to help you safely proceed. Follow these and the other emergency instructions you'll find there. You'll also find further instructions on the label attached to your jack body. Proceed with caution when jacking up your vehicle, removing the flat tire and installing the spare tire.