If you know the current one, just login to the admin interface, find the 'SECURITY' section and reset it to whatever you want. If you do not know it, you will need to reset the router (usually a simple push-button on the bottom or back - press and hold for a few seconds) and then login using the default login/password for the router and start over.
Answers & Comments
Ok its simple go to system tool and password and change...
If you know the current one, just login to the admin interface, find the 'SECURITY' section and reset it to whatever you want. If you do not know it, you will need to reset the router (usually a simple push-button on the bottom or back - press and hold for a few seconds) and then login using the default login/password for the router and start over.
ok its simple go to system tool and password and change.... arun