read this http://www.belkin.com/networking/manual/MAN_F7D6301_v1_8820-00697_Surf_N300_N_Router.pdf
LOST ROUTER LOGIN PASSWORD
If you have forgotten your personal router login password there is no way to recover it. You will have to reset the router. This means all the settings on the router will be reset to factory defaults. It also means that all your connected devices will need to be connected again with the new security information (WEP, WAP, etc,) . You will need the default admin login name and the default admin password. This can be found in the user guide that came with the router. This can usually be found online at the router manufacturers site.
There is usually a button or a switch hidden in a pinhole opening on the back of the router. Pressing and holding the switch for 10 seconds or so will cause the reset and usually the LEDs will flash and blink for several seconds as the router firmware resets and clears out the old information.
If you are trying to get into someone else's router illegally there is no way to find out their login password.
For future reference, write the password down, or a hint at what the password is, on a piece of tape and secure it on the bottom of the router. I use my cell phone memo function to store all my passwords.