i want to make it to use it as a Mic.
Are you confused about the fact that the mic has two leads and the jack has 3? If so, the answer is simple: Just attach both of the positive wires to the positive lead of the mic, and attach the ground wire to the negative lead. The jack was probably designed for a stereo device and not a mono device like a single microphone.
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A "jack" is a connector, you need to join it TO a microphone. What have you got ?