FC660M Configure For Mac

private.xml

<?xml version="1.0"?>
<root>
  <!-- This is a Personal Configure for My Leopold Keyboard By Syhily -->
  <devicevendordef>
    <vendorname>LEOPOLD_VENDOR</vendorname>
    <vendorid>0x04d9</vendorid>
  </devicevendordef>

  <deviceproductdef>
    <productname>LEOPOLD_KEYBOARD</productname>
    <productid>0xa097</productid>
  </deviceproductdef>

  <item>
    <name>A Custom Setting For My Dear FC660M</name>
    <item>
      <name>Left Window To Left Option In Leopold KeyBorad</name>
      <identifier>leopold.left_window_to_option</identifier>
      <device_only>DeviceVendor::LEOPOLD_VENDOR, DeviceProduct::LEOPOLD_KEYBOARD</device_only>
      <autogen>__KeyToKey__ KeyCode::COMMAND_L, KeyCode::OPTION_L</autogen>
    </item>
    <item>
      <name>Switch The Escape To Backquote In Leopold KeyBorad</name>
      <identifier>leopold.switch_escape_backquote</identifier>
      <device_only>DeviceVendor::LEOPOLD_VENDOR, DeviceProduct::LEOPOLD_KEYBOARD</device_only>
      <autogen>__KeyToKey__ KeyCode::BACKQUOTE, KeyCode::ESCAPE</autogen>
      <autogen>__KeyToKey__ KeyCode::ESCAPE, KeyCode::BACKQUOTE</autogen>
    </item>
    <item>
      <name>CapsLock To Backquote In Leopold KeyBorad</name>
      <identifier>leopold.capslock_to_backquote</identifier>
      <device_only>DeviceVendor::LEOPOLD_VENDOR, DeviceProduct::LEOPOLD_KEYBOARD</device_only>
      <autogen>__KeyToKey__ KeyCode::CAPSLOCK, KeyCode::BACKQUOTE</autogen>
    </item>
    <item>
      <name>Alt To Command In Leopold KeyBorad</name>
      <identifier>leopold.alt_to_command</identifier>
      <device_only>DeviceVendor::LEOPOLD_VENDOR, DeviceProduct::LEOPOLD_KEYBOARD</device_only>
      <autogen>__KeyToKey__ KeyCode::OPTION_L, KeyCode::COMMAND_L</autogen>
      <autogen>__KeyToKey__ KeyCode::OPTION_R, KeyCode::COMMAND_R</autogen>
    </item>
    <item>
      <name>Right Ctrl To Right Option In Leopold KeyBorad</name>
      <identifier>leopold.right_ctrl_to_right_option</identifier>
      <device_only>DeviceVendor::LEOPOLD_VENDOR, DeviceProduct::LEOPOLD_KEYBOARD</device_only>
      <autogen>__KeyToKey__ KeyCode::CONTROL_R, KeyCode::OPTION_R</autogen>
    </item>
  </item>
</root>

How do I apply this configuration?

@husnulhamidiah You will need a application named karabiner