Two PC's, one cable modem, running DHCP, basically factory settings on the router. How do I use static IP's with this setup. I know how to tell the router to disable DHCP, but what do I do on the PCs?

At home I operate an Airport Extreme network, on the network are a few laptops and one server running Windows Small Business Server 2011. One of the requirements for SBS is that it must act as DHCP ...