We are trying to sign on wireless to laptop and

The only way around this would be to reset the router which brings it back to factory default settings (such as no password)
To do this, if you look around the base of the router, you should see a very small hole labeled "reset" (sometimes it's close to the power connection). Using a paper clip put it in the hole and very gently push in and hold for a few seconds.
Now just access the routers configuration web page and put in your new password.

Hope this helps.

the password of wireless access thru the routers are usually ritten on the back of the router.

flip the router, there will be a SSID or SN no.

thats the name of ur wirless network

then there wuld be a WEP KEY, thats the password, type it in the exact same way on your computer screen wen it asks for wireless key

this should work