Most printers are now USB based, which allows you to easily connect the device to your computer. However, if you want to connect your USB-based printer to a network, you may need to convert the USB cable to an Ethernet connection, or RJ45. Converting the cable actually only takes a second or two, and you can find the required adaptor at most electronics and computer stores.
Plug the USB cable into the USB port on the printer.
Insert the other end of the USB cable into the USB port on the USB to Ethernet RJ45 adaptor.
Connect an Ethernet cable into the Ethernet side of the RJ45 adaptor. Plug the other end of the Ethernet cable into the "WAN" port on the network adaptor or to whatever you want to connect it.