i think that's the default user and password, unless you decided to change them. put in google ur modem/router name default password and look up for the password and try it.
usually they ask you to input the user and password after you hit 192.168.1.1 or something similar, and before they display the contents of this page.
now if you can see the contents of this page then ur modem/router doesn't require a password.
the password and username are of your internet account. i'm an idm dsl user and mine are something like this: username
L343282@idm.net.lb and the password is something i set. so search in that page where to put them.