|The blue connector should be the Input (mic or line-in) athe the back|
In the front, the connector next to the USB connectors.
You may have to adjust the "recording" settings to suite the Microphone:
1. Click Start Start button, and then click Control Panel.
2. Click Sound.
3. Click the Recording tab.
4. Click the microphone device Line-in (should be detected), and then click Properties.
5. Click the Levels tab. Move the slider to increase or decrease the volume.