Msi motherboard front audio jack not support

Hi! my name is Hasan.I just built a new computer using MSI motherboard but I have a problem with the front jack audio. When I plug a headphone or microphone in the front panel there is nothing happen. I don't hear any sound from my headphones. I've already checked the connection between jack and mainboard but everything is connected.
Can I modify the front jack to make it support to mainboard? because I see two pins left on the mainboard and they don't have connection with the jack. Could anyone help me please? Thanks.