Hi,
You mean your laptop has only 1 audio port and your headphone has 2 3.5mm cable ends right? You'll need a splitter for that if that is the case.
Here' an example of that splitter you'll need.
http
/www.ebay.com/itm/3-5mm-Stereo-Headphone-Audio-Male-To-2-Female-Y-Splitter-Cable-Adapter-Plug-Jack-/131524702079