Just reset it then. Default settings should be good enough.

Resetting

Resetting this box is dead easy, all you have to remember is - Be Patient! When reset using the little blue button, make sure the test LED really is on solidly. The LED will come on seemingly solidly after starting, but keep the reset button pressed for quite a few more seconds. The LED blinks off, then stays off for about 10 or 15 seconds, before blinking rapidly and finally glowing solidly. If you don't get this, activity you have not reset the router. After you reset in this manner you are completely back to factory defaults.

Or just find the book and follow the instructions.