P000257700 is microphone number and it could be placed in different places depending on the Toshiba series laptop itself, but most probably it is either (A) right above the screen or (B) right in front of the keyboard where you hold your palms while typing with fingers.
There should be a small hole with either "MIC" written besides or some microphone symbol like <<*>>
P.S. You can also plug ear-buds in the microphone socket - it seems strange, but it ear-buds work just like a microphone.
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That would depend on your laptop and operating system.
There may be variations to this.
Get into Control Panel / Sound and Audio Devices then look around for Mic In, turn it ON and adjust the volume.
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