Saga Lout :
Ask the owner. We can't help you because you might be trying to gain access to a neighbour's network.
I too am having the same issue. I am the owner of a Belkin N600 router. I have an Arris gateway bridged with my Belkin N600 router. My router has 3 signals (Belkin.0c1, Belkin.0c1.5, and Belkin.0c1.guests). I didn't even know about this signal because my laptop just automatically logs into one of the other two.
Just for s#:ts and giggles, I tried connecting to my own personal router's "guest" signal and it prompts me for a password. I put in my password for the router, or at least for the other two main signals, and it is wrong. p-a-s-s-w-o-r-d is wrong too.
Just sayin'.... that other guy is most likely not dense enough to go on here and say "blah blah blah need password" to gain access to some "neighbors" router.