To remove the optical drive, unlatch and remove the base cover and front bezel of the system. Then flip the front panel over to access the internal components of the system. Identify the optical drive and disconnect the cables. Flip the front panel back over and unlatch the optical drive to remove it.
To reinstall the optical drive, relatch it back to the system. Flip the front panel over and reconnect the cables. Flip the front panel and latch the front bezel and base cover on the system.