Using your Apple MacBook Pro Retina is easy. Just press the power button to turn it on. You can use the trackpad to navigate around the screen. For apps, click on the Launchpad icon and select the app you want. When charging, use the provided charger and plug it into a power outlet. Make sure to keep your MacBook in a cool and dry place. Avoid exposing it to direct sunlight for long periods. Clean the screen gently with a soft, dry cloth. If you plan to customize the SSD or RAM, it's best to have it done by a professional to avoid any damage to the device.