To remove the hard drive, unlatch and remove the system's base cover. Then unlatch and remove the front bezel from the system. Find the front panel and flip it over. Identify the hard drive and disconnect the cables. unlatch and remove the hard drive from the system.
To reinstall the hard drive, place it back in the system and relatch it, reconnect the cables, flip the front panel over and secure the front bezel and base cover on the device.