oof. i dont think you're gonna be able to put the network card in. if you dont have a network card at ALL, (aka you dont have one on your computer) use a usb 3.0 -> ethernet port adapter, or a usb 2.0 -> ethernet if you dont have usb 3
heres a good one https://www.amazon.com/Ethernet-Network-Adapter-CableCreation-Required/dp/B013G4C8RE