Wi-fi security

Open the web browser that you use and type in the IP address for your router,and press the Enter key.

A window will open and then type in your routers default username and password,and press the Enter key again

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.
Write the Security Passphrase down and put it in a safe place.
Save settings and close your browser.