I need help connecting my desktop to the network
Can you describe your setup, e.g. modem/gateway/router make/models? Maybe identify your desktop make and OS, as well. Generally, you'd connect an ethernet cable from your gateway/router to a port on your desktop, if close enough. Or, if your gateway/router has WiFi on and your desktop has WiFi capability, then you might activate the WiFi adapter and see what WiFi networks it sees.