I have a N1 belkin wireless router and have lost

First RESET your router to defaults.
for that press RESET button for 10 seconds RESET button is in back side of router.
Then connect your router to computer with ethernet cable.
Then you can access it with following link.
http://192.168.15.1

type user as "admin" and password as "admin" or blank or "password"
Then you can see configuration page of router.
Set WAN settings as your internet service provider settings.
Enable DHCP .
CLick on wireless and enable wi fi.
If you want secure router then enable WEP security then add new code it is your password key for connect wi fi.
Let me know if you need further assistance.
Thanks.