That device doesn't have a separate 3.5mm port for a microphone. It will be either set up with a dual (input/output) jack so that mic and headphones use the same one, or the jack is only set to work with headphones/speakers and not microphones.
Should it be a jack that doesn't do input, then you would need either a microphone that connects via USB, or an adapter so that you can use the mic you have in a USB port.