If your PC has a single Audio port and the Cosmic Byte headphone has separate audio and microphone jacks, you will not be able to use the microphone on the PC.
SOLUTION
You will need a 1 Female- 2 Male Audio Mic Cable which will merge the Audio and Mic input of your headphone into a single audio jack.
Buy Link: https://www.thecosmicbyte.com/index.php?route=product/product&product_id=83