As Dan said, there is never, ever a reason for a network setup utility or TCP stack to be asking for *ANY* wifi modem/router/AP admin login credentials.
When trying to admin it, yes - and by that I mean when you go to configure the Wifi point via a web browser, you will require such info - but never for just network access. Most decent Wifi boxes require a wired connection to config.
I don't wish to sound snarky in the least - and quite honestly, I've been following your threads on your issues with this with great interest, because I love seeing people have their "AHA!" moment while figuring out new technology. But you perhaps might be better served by reading the manuals on the actual networking devices themselves and reading up on basic mechanics of networking and wifi in particular. Again, no offense - but if you don't know what an SSID is, you do need to bring yourself up to speed on the basics.
Best of luck, and holler if you need any help.