Manually Reconfiguring LAN: How-To

Welp, it looks like my laptops at home are unable to detect the internet connection we have at home despite being plugged to the same router that my desktop uses... Which makes it all the stranger, as I'm able to browse the internet right now with the desktop while it's connected to the router/hub (so it's sort of like modem => router/hub => desktop right now).



Looks like a manual configuration is in order... except it's been years since I've done this, so I need help.

Manually Reconfiguring LAN: How-To