The following trick will help you to "create a microphone" when you need one to speak to other people, but you should remember that this is just a temporary solution.
Maybe you don't know that there is not much difference between the circuits of a Microphone and a Headphone. The headphone is designed to spread voice and a microphone to capture the voice. So you can use your spare headphones as a microphone. The following is how to do it:
1. Connect the headphone in the microphone slot of your computer and use it as a microphone.
2. Just speak in the ear buds of the microphone.
Note: you need to speak a bit loudly to be audible at the other end.
