switch

I have network switch to connect my PC and my friends' PC together. By the way, the dormitory provides internet connection by only one device that uses USB port. When we want to connect the internet, we have to plug the USB internet connection provided by the dormitory to one PC and use the internet via network switch. But it does not work. Only the PC that connect to the USB internet connection can connect the internet. How to configure it so that Every PC can connect internet via network switch?