"User Name" & "Password" for my Dell Router?

I have a Dell desktop computer that I access the internet with & the printer is hooked up to this computer as well - I am trying to connect/network my wireless laptop (which can already connect to this computers router) to this desktop computer (so I can share files & be able to print) - my laptop is asking for my Dell Router "User Name" & "Password" - when I configured the router I remember the WEP Key but I do not know where I can retreive the "User Name & "Password" - where can I find this information - thx