are you talking about changing the password to access the gui of your router? Or are you talking about changing the wifi password for your wireless router? If you have a netgear router their support page is http://support.netgear.com/
I think this is the problem. Many of us don't know what is wanted. I arrived here via support for Netgear. I have just acquired a Kindle. Before it will connect to the internet to download anything a password is required. My wireless Netgear router is connected to the net via an optical cable provided by Virgin Media. I have entered the Netgear password, the broadband password and my email password. None of them works. The Kindle detects 3 & even 4 networks. Two of the network names I recognise and I suspect I may have done the setup procedure twice with slightly different names. Maybe first with a cable router and again when I bought a wireless router. Since my desktop, cable connected, and my netbook, wirelessly connected, both work properly I wondered if the sensible thing to do would be to change the password using the desktop and then use the new password to connect the Kindle. I find changing the password is not as easy as I expected. What advice can you offer?