I found this USB called USB Sierra wireless model 598 I plugged in to my desktop computer windows and istallef the USB after it is done it appeared an icon on my desktop so I click on it and shows a window with two options one is wifi but it doesn't show anything and the other is mobile broadband and shows the signal strength 80% and a button that says connect but when I click on it it says connecting but after a while an error appear with the following."error 691: acces was denied because the username and/or password was invalid on the domain" how do I get that password or what can I do to connect the mobile broadband?