Admin password? If so, do you know the current one? If you don't, you'll need to do a factory reset (with it powered on, press the reset button for 30 seconds and then release. it will reboot and be in default state. If you already know the password, follow this guide: http://www.solveyourtech.com/how-to-change-the-router-password-on-your-netgear-n600/