The "Uplink" port shouldn't be your problem, that is used if you want to expand your network with a hub or switch. If your not going to expand your network in this way, make sure the "Uplink" switch is in the "Normal" position. Anything in port 4 (with "Uplink" on) will be seen as a hub or switch and service could be intermittent for that one host. Your modem should be in the "WAN" port.
There should be a reset switch somewhere and in the manual a procedure to reset the router to the factory defaults (Start over).
Unless your running wireless, there should be no need to configure anything, DHCP and NAT should be plug and play unless you want to lock down MAC addresses.
