Kayzar, each motherboard is different so the pictures below are just to help you know what to look for. Also instead of 2 rows of pins it could be one long row.
This first picture shows the location of the pins on this motherboard. It is a common location for the pins but it doesn't necessarily mean your pins will be found here.
The second picture is a close up view to help you recognize the header pins.
Once you find the pins look on the motherboard next to the pins for connection info. It may say something like PWLED or RESET SW or IDE LED.
Edit: Does the last picture look like your motherboard?