Step1: Read THIS TOPIC to know the default user and password of ADSL Modems:
If you can not connect to that ADSL modem with the default us, pw -> Press to Reset button on that Modem (Load the default us, pw).
Step2: After connect 2 that modem with default mode, you can "hack account" !
Step3: In your modem configuration homepage, Click to a page that show your user (password is ***) And Right click to a blank space > This frame > View Frame Source (Image 1) > You'll see the password (Image 2) !
With "View Frame Source" (In firefox) TIPS, you can HACK as much as you WANT !