If you go to a computer that is currently connected to your wireless network and open the control panel. Select Network and Internet and then select Homegroup , then select Print and View the Homegroup Password. The next page will have your wireless network password.
If your wanting to change the passwqord in the router then you can go into the routers settings and undr wireless and wireless security you'll see the word or passphraese that you chose for an encryption.
If you set a new password to enter the router and that's the one you can't remember then you can press the reset button on the bacxk of the router and set it to factory specs and then use the default user name and password to enter the router.
1)Open the web browser that you use: Firefox,Google Chrome,IE,or Opera and type in the IP address for your router,and press the Enter key. http://www.routeripaddress.com/< Router ip addresses can be found here
2)A window will open and then type in your routers default username and password,and press the Enter key again http://www.routerpasswords.com/< Router usernames and passwords found here
3)Navigate to the Wireless Security\Network Security Settings Tab and open it to locate or change your WEP or WPA Security Passphrase. Use WPA because it provides better security.
4)Write this Security Passphrase down and put it in a safe place to access when needed.