@jhopkins...
GUI - graphical user interface: basically either the standalone application, or (in most cases) the web page presented by the router for its administration. If you haven't changed your network settings from the default, this is likely to be at the address 192.168.1.1 on your local network. I hope you've changed the password from the default as the factory one is easily found on the web and you'll be exposed to the possibility of someone hacking your network, opening you up to all sorts of identity theft oppportunities
IP - Internet Protocol: part of the mechanism by which all the devices attached on your network are identified and can talk to each other. IP uses 'addresses' for each device and interface (some dvices have more than one interface). The address I gave above for your router is an IP address
DHCP: a way for your router to dynamically (i.e. on request from another device) allocate addresses within a valid range so that they can all talk to eachother. There are rules about what addresses can "see" eachother without some kind of intermediary. Your router does exactly that when you access the external 'web'. You can Google what DHCP stands for, but it probably won't help beyond this description.
LAN - Local Area Network: your (hopefully) private home network up to and including your 'inward facing' side of your router.
Anyway, to the real point, with my SureSignal 1 I have never had to 'open' any ports, alter any other settings on the router or intervene in any shape or form to get it to connect via any of my routers (and I'm on at least my 4th, of 3 different brands - including Netgear). I have just plugged it in, connected it to my home network (via a 'home plug' network at the moment as it happens) and it has just worked. The v3 I had needed more intervention - and didn't like my (rural) broadband speed anyway, so it never connected and got returned.
So before you go in to your router and start to change anything that you may or may not understand, what *exactly* is the problem you're seeing? When you power up your SureSignal 1 and connect it to your network, do you see the green lights start to flash in different orders? When you've left it for about an hour or so, what lights are on?
By the way, if you have an Apple iOS device I can recommend an app called "Fing" which will detect all the devices on your network and tell you a bit of information about each device. On my network it shows my SureSignal to be SAGEM (the maker of some of the innards of the SureSignal), so I can see a) that it has an IP address allocated by the router and b) that the router hasn't got confused and allocated two devices to the same address.
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