To remove the hard drive, unlatch and remove the base cover. Unlatch and remove the front bezel. Then flip the front panel over to access the inside of the system. Identify the hard drive and disconnect the cables. Remove the latches and lift the drive out of the system.
To reinstall the hard drive, place it back in the system and latch it into place, reconnect the cables, flip the front panel over to cover the system, secure the front bezel and base cover on the system.